Best Review of Shell Rotella T6 5W40 vs 15W40 in Jan 2023 

Rotella T6 5W40 vs 15W40

5/5 - (107 votes)

The main difference between Shell Rotella T6 5W40 and 15W4 is viscosity which allows you to choose one for your diesel engine vehicles. Diesel engines are a unique breed in terms of compression ratios, torque, and output. This new low-emission diesel can run at exceptionally high temperatures, shearing oil at a much faster pace and producing more soot than older diesel.

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1Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil Check Price on Amazon
2Shell Rotella T6 Full Synthetic Heavy Duty Engine Oil 5W-40, 5 Gallon PailCheck Price on Amazon
3Shell Rotella T6 Full Synthetic Heavy Duty Engine Oil 5W-40, 1 Gallon, Pack of 3

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4Rotella T6 Full Synthetic Heavy Duty 0W-40 Engine Oil - 5 Gallon PailCheck Price on Amazon
5Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine OilCheck Price on Amazon

Use synthetic oil on your automobile as it improves performance, reduces wear and tear, and extends engine life. These lubricants are more efficient than ordinary motor oil because they go through an engine’s components with less friction.

Less friction in the engine means less fuel consumption. Synthetic oils last significantly longer than traditional engine oils, making them less expensive over time. These oils protect against rust corrosion and oxidation induced by oxygen interaction.

In terms of quality and performance, Rotella oils have a long track record of reliability. More and more people are turning to Shell Rotella T6 5W-40 and Shell Rotella T6 15W-40 as alternatives throughout time. Shell Rotella T6 5W40 vs 5W40 T6 synthetic oils will be reviewed in detail in this article. In particular, we’ll talk about:


  • Difference between T5 and T6Difference between 5W40 and 15W0
  • Fair comparison of Rotella T6 5W40 vs 15W40
  • Rotella T6 5W40 review and Rotella T6 15W40 review
  • What is the most excellent option for your car, and why is it the best choice?


Product Description:

In this post, before considering the goods and bad of Shell Rotella T6 5W40 vs 15W40, let’s explore the manufacturer’s claims about the product.

According to the makers of Shell Rotella T6, if you’re looking for the best oil for your diesel car, go no further than the Shell Rotella series of heavy-duty oils. Shell Rotella T6 Full Synthetic heavy-duty engine oil has “Triple Protection Plus” technology to combat wear, deposits, and oil breakdown, which incorporates completely synthetic base oil and modern additive technology.


The low temperature, flow, and fuel economy are also improved with these engines. In addition to the 0W-40 viscosity for shallow temperatures, Shell Rotella T6 full synthetic 5w40 diesel oil is also available in Shell Rotella T6 5W-40 vs 15W-40 viscosities.


You can rely on Shell Rotella T6 Full Synthetic Diesel Engine Oils for fuel-efficiency performance, compliance with exhaust emissions control systems, and protection at harsh operating temperatures. Manufacturers claim that Shell Rotella is a high-performance engine and radiator coolants and lubricants. Heavy-duty diesel engines benefit significantly from their defense. After comparing Rotella T6 5W40 vs 15W-40 it is clear that these synthetic oils provide a wide range of specialist Rotella oils that are proven to protect your vehicle in all weather conditions.


Shell claims that Rotella T6 5W40 temperature range is up to 200oF and it offers superior protection against hazardous wear and corrosion over API CJ-4 oils of prior generations (93oC).

Shell Rotella T6 5W40 vs 15W40 – A quick overview:

FEATURS 5W40 15W40
Improved piston cleanliness to industry standard Yes Yes
Improved low temp flow Yes Yes
Better drain intervals Yes Yes
Breakdown resistance under high temp Yes Yes
Shell 300K mile or 10 year protection Yes Yes
Shell 500K mile or 10 year protection Yes Yes
Prevent engine wear Yes Yes
Viscosity 5W40 15W40
Best for Motorcycle, Car Truck, Ford,wss


Before going deep into the Shell Rotella T6 5w-40 vs 15w-40 review, it is essential to understand the Rotella T4, T5, and T6.


You may choose from three different kinds of engine oils depending on your vehicle. Synthetic and synthetic blends are better suited to current engines than conventional oils, which are best suited for older and simpler engine models. Even if you’re a vehicle aficionado or at least know a little about motor oils, it might be tough to narrow your search to just one.


The overall oil type of T4, T5, and T6 are:


  • Rotella T4 is typical engine oil with additives to improve viscosity, anti-wear, and other qualities. Compared to synthetic and semi-synthetic oils, the significant benefit of using traditional engine oil like Rotella T4 is a 10 percent savings. But during the depths of winter, they are rendered almost useless.


  • Rotella T5 is a synthetic mix of semi-synthetic oil that combines traditional and artificial components. It allows for far more extended periods between oil changes than either conventional or completely synthetic motor oils.


  • Rotella T6 engine oil is completely synthetic and may be used in any weather situation. This synthetic motor oil, like all others, does a fantastic job of protecting engines, but it comes at a high price.

Shell Rotella Synthetic 15w40 Motor Oil Review:

Unlike traditional and semi-synthetic Rotella 5W-40, Shell Rotella T6 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil has been engineered and produced to deliver superior performance. This is excellent motor oil with a 5-star rating, and it is made to operate well in humid and hot surroundings, and that’s precisely what it’s intended to do.


It is designed for new low-emission heavy-duty engines and older hard-working diesel engines. It is a fantastic option for the general haul, on-highway fleets, construction, agricultural, and diesel pick-up trucks because of its wide variety of requirements and certifications from several of the world’s major engine manufacturers.


Prominent Features of Shell Rotella T6 5W40 and 15W40:

You may increase the performance of your engines, including horsepower and fuel economy, by using this oil. The ability to utilize all and any Shell Rotella T6 specs will make it easier for you to repair your automobile.


15w40 full synthetic diesel oil is engineered for maximum performance, and it safeguards your engine and aids in fuel efficiency improvement. It also complies with API SN and ACEA A3/B4 standards in Europe and the United States. This product offers wear protection, boosts fuel economy, minimizes friction, and raises performance by lowering pollutants. Its prominent features include:

·         Improved engine protection:

A heavy-duty Shell Rotella T6, when compared to other motor oils, steel engine oils are better at protecting against wear, sludge, and corrosion and being more stable at high temperatures. Thanks to their outstanding protection, oil-cooled engines give the most exceptional performance without losing efficiency at all speeds.


Both mechanical and corrosive wear may occur in an engine, and these two forms of wear are often seen together in automobiles and other engines. Engine oil’s primary role is to prevent wear and tear. 15w40 synthetic diesel oil Rotella not only met CK-4 specifications in API industry wear testing, but it also exhibited an 85 percent increase in copper corrosion protection and a 98 percent improvement in lead corrosion protection, an average of 50 percent greater wear protection than necessary.

·         Better Deposit Control Compatibility with Emissions Systems:

When nitrile sludge deposits are a regular occurrence in high load engines, complete synthetic Shell Rotella T6 15w40 Diesel Motor Oil is an excellent choice. Rotella 15W40 temperature range is minus 22 F to 122 F. It complies with the Euro 4 emission standards. In accordance with the US EPA criteria for low-temperature protection requirements, the oil stays synthetic at temperatures up to 150°F (65.6oC).


Soot, grime, and other pollutants are better protected by advanced multi-functional dispersion additives with Shell Rotella T6 15W40 synthetic base oils.


·         Fuel Efficiency:

Shell Rotella T6 15W40 diesel oil improves fuel efficiency for heavy-duty diesel engines. Shell Rotella T6 15W-40’s lower volatility, combined with the detergents and dispersant it contains, aid in oil consumption management. Oil volatility is more lacking in Shell Rotella T6 15W-40 than conventional Shell RotellaT4 15W-40.


·         Protection against cold climate:

When we compare traditional and synthetic mix Shell Rotella 5W-40 products to Shell Rotella T6 15W-40, it appears that the latter offers more excellent cold cranking qualities and pump ability at low temperatures of -15C. In colder areas, this means it reaches vital engine components more quickly, reducing wear and making hard work more accessible.

Shell Rotella Full Synthetic 5W20 Motor Oil Review:

Full synthetic Shell Rotella T6 5W40 diesel engine oil has a 5-star rating for its quality. It’s made to operate well in humid and hot surroundings, and that’s precisely what it’s intended to do.


Premium base oils and synthetic technologies are used to produce this oil. It’s shown to be an excellent fit for diesel engines. In addition, it is very resistant to abrasions, corrosions, foaming, and deposits. All turbocharged diesel engines, even those with variable geometry turbos, may benefit from the anti-foam ingredients of Rotella T6 5w 40 synthetic.


The Rotella T6 5w40 specs show clearly that this oil is not suitable for racing types of vehicles, and the wrapping up of the engine can’t be done quickly. Other features include:


·         Better lubrication:

Superior lubricants in Shell Rotella 5W-40 set it apart from the competition and ensure that your car’s engine gets the possible performance out of it. Everything from Alfa Romeo to Seat to VW to many other recent city vehicles and SUVs and vans with engines under 2 liters should be used.

·         Increased fuel efficiency:

Shell Rotella synthetic 5w40 motor oil maintains appropriate shearing force inside the cylinder and maintains lubricant film thickness at its ideal level to protect your vehicle’s engine. As a result, oil changes may be delayed since the motor can run at a lower temperature without wearing down the engine components. This reduces wear-and-tear stress on cams as a consequence of increased fuel efficiency.


Its temperature range is the same as 15W40. This informs us that with a 5W40, you have a 37-degree cold-cranking advantage (from minus 22 to plus 15).

·         Lesser fuel consumption:

Manufacturers of all types of vehicles are making environmental preservation a priority since there are several ways to enhance the performance of their engines in the years ahead. Fuel consumption and smoke emissions are also reduced due to the progressive decrease in combustion temperature, resulting in no more hazardous pollutants being discharged into the atmosphere.

Using Shell Rotella T6 5w 40 full synthetic engine oil can help you save money on gas and lower your vehicle’s emissions. Fuel consumption may be reduced by 1.5 percent thanks to Shell’s most modern technology, Shell Rotella T6 5W-40 synthetic heavy-duty engine oil, without sacrificing engine protection or longevity.

·         Exceptional protection against oxidation:

Fuel consumption may be reduced by using Shell Rotella T6 full synthetic 5W40 diesel engine oil, which decreases engine wear and prolongs the life of your vehicle’s engine. There is also an increase in fuel economy.

Synthetic base oils and innovative multi-functional dispersion additives protect heavy-duty diesel engines against the impacts of soot, grime, and other pollutants.

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Price comparison of Rotella T6 5W40 vs 15W40:

The cost of the Shell Rotella T6 5W40 vs 15W40 synthetic oils are prohibitive for many diesel engine owners who want the best for their vehicles. Using the oil may not have any noticeable effect on performance for certain people. You can trust Shell Rotella T6 to provide the best protection for your diesel engine while ensuring maximum performance. Your engine will last longer thanks to additives like shear stability, which are included.


The price of Rotella T6 5W40 is higher than 15W40. Amazon offers the Rotella T6 best price for both of its versions:


  • $34.99 for Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)
  • $24.37 for Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of 3)

Understand the difference between Shell Rotella T6 5W40 vs 15W40:

The 5w40 is premium oil, which means it’s been developed specifically for high-performance engines. The viscosity of Rotella T6 5W40 vs 15W40 has major difference. Due to its greater viscosity, 5W40 surpasses 15W40. High viscosity oils flow readily when cold and protect against wear and corrosion when heated.


Industrial engine oil 15W40 is designed to withstand higher loads and higher temperatures than those often found in automobile engines. The viscosity grade 40 is the same for each of these oils. However, the 15W40 oil has a greater viscosity, whereas the 5W40 crude has a lower viscosity when the engine starts up.


Shell Rotella T6 5W40 vs 15W40 – which one is the best?

Both 15W40 and 5w40 diesel engine oils are superior in terms of performance. Both of these fully synthetic oils offer their best results according to the vehicle’s needs. However, since the 5W40 has a lower viscosity than the 15W40 diesel engine oil, it facilitates cold start-up in very cold temperatures.


Aside from that, the 5W40 engine oil also lubricates the engine components more quickly than the 15W40 engine oil. There is no match for the 15W40 engine oil’s ability to keep the oil flow and pressure optimally balanced at high temperatures.


In the conclusion of Shell Rotella T6 5W40 vs 15W40, we suggest that both the products have top-notch quality, and you can decide one that is best for your car’s engine.


Shell Rotella T6 5W40 and 15W40 heavy-duty diesel oils provide extraordinary lubrication for your vehicle’s engine and good protection against wear. For optimal protection against wear and corrosion, as well as a reduction in friction and heat, you can use both of these premium-quality oils.


These products also provide benefits to essential parts like spark plugs and cylinders by decreasing the buildup of sludge and varnish, as well as a reduction in the amount of smoke and an improvement in horsepower.



Q#01: Why T6 5W40 is more commonly used than T6 15W40 oil in your engine?


Answer: T6 5W40 oil may be used in most circumstances instead of T6 15W40 engine oil because its start-up viscosity grade seldom affects an engine after it reaches operating temperature. However, the problem arises when the engine is too cold and too hot. In this scenario, 5W40 oil works better in cold circumstances, whereas 15W40 performs better in excessive heat. However, the demand for your car and the outside temperature is the primary determinants.


Q#02: How long does Shell Rotella T6 last?


Answer: As long as you use Shell ROTELLA T6 Full Synthetic heavy-duty diesel engine oils regularly and correctly, your engine should last for up to 10 years with no significant issues (500,000 miles on a single cylinder).


Q#03: What’s the difference between Rotella T5 and T6?


Answer: Rotella T5 and T6 perform better in cold climates since their oil flow features enable you to safeguard your engine at a lower temperature. However, if you must drive it, its temperature decrease makes it the best option for keeping you cool.



Amazon links to buy Shell Rotella T6 range:

1.      Shell Rotella T6-5W40:


Shell Rotella T6-5W40



This product protects the vehicle against wear, deposits, and oil breakdown while improving low-temperature flow. It has 1.5 percent improved fuel economies without sacrificing engine protection or durability (compared to 15W-40 oils). T6 5W40 shows extended longevity in heavy-duty engines from pickup vehicles to tractors and semi-trucks. A low-ash formulation protects its high-performance exhaust catalysts and particle filters.

Multi-functional dispersion chemicals defend against soot, grime, and other pollutants (compared to the previous formulation). It shows shear stability for improved viscosity management and engine oil pressure. Rotella T6 5W40 shows faster cold-cranking and low-temperature pump-ability.

2.      Shell Rotella T6-15W40:


Shell Rotella T6-15W40


The Triple Protection Plus technology of Rotella T6 15W40 guards against wear, deposits, and oil breakdown while improving low-temperature flow. It also shows extended longevity in heavy-duty engines from pickup vehicles to tractors and semi-trucks.

Multi-functional dispersion chemicals defend against soot, grime, and other pollutants (compared to the previous formulation). It has improved shear stability for improved viscosity management and engine oil pressure.

·         Shell Rotella T6-0W40:


Shell Rotella T6-0W40



Oil with Triple Protection Plus technology protects against wear, deposits, and oil breakdown while improving low-temperature flow. This product shows extended longevity in heavy-duty engines from pickup vehicles to tractors and semi-trucks. It also offers the same qualities as mentioned in the above two products.