Quick Answer: When Should I Use 15w40 Oil?

What is 15w 40 oil used for?

Product Description.

Mobil Gas Engine Oil 15W-40 is a premium fleet engine oil specifically formulated to provide reliable protection for trucks and buses using Compressed Natural Gas (CNG) or Liquefied Natural Gas (LNG)..

What is the best 15w40 oil to use?

Milesyn SXR 15W40 API CK-4 is one of their best engine oils. There’s no more versatile engine oil for diesel-powered vehicles like this one. Compatible with almost any diesel engine, this oil meets the performance requirements for most major diesel engine brands including Mack, Cummins, Ford, and many others.

Which oil is thicker 10w40 or 15w40?

Motor oil grade represents the weight of the oil when cold, as well as at operating temperatures. Viscosity or thickness of the oil increases with rise in temperature. A 10W40 oil will be thicker in the cold than 15W40 oil, but they will have the same viscosities at higher temperatures.

Is diesel oil bad for gas engines?

Diesel oils have to put up with much higher engine temperatures, higher oxidation rates, sulfur deposits, fuel soot, acids and other deposits and conditions not usually found in automobile engines. So it would make sense that using diesel oil in a gasoline engine would enhance the latter’s longevity.

Can you use 15w40 diesel oil in a gas engine?

Diesel oils perceived as “tougher” Others lean toward higher-viscosity oils to protect against wear. Some want to run a 15W-40 oil in their gas engine, and it’s often easier to find a 15W-40 or similar viscosity of diesel oil than a gasoline motor oil. Others favor the increased detergency of diesel oils.

Which is thicker 5w40 or 15w40?

15w40 is slightly thicker at high temperature. Cold is the same. … 5W40 oil is thinner than 15W40.

Can I use 15w40 instead of 5w30?

5w30 flows better than 15w40. 5w30 provides best cold start properties. Using 15w40 instead of 5w30 will increase your fuel consumption because of more load on your engine’s crank. … No, you won’t blow a head gasket, but 15W40 is too heavy an oil to use where 5W30 is required.

What happens if you use 15w40 instead of 5w40?

Viscosity is a fluid’s resistance to flow. … Both will have a viscosity of a 40 grade. That cannot be said for both oils during the dead of winter. The 5W-40 will have a lower viscosity when the engine is started than the 15W-40; consequently the 5W-40 will start easier and lubricate quicker in the cold than the 15W-40.

Can I use SAE 40 instead of 15w40?

You can but it’s not the best, especially if the engine has to start in cold temps. An SAE 40 oil is quite viscose at temperatures below about 10–15c, so at lower temperatures the engine will struggle to turn over to start it, and the oil pump will struggle to move the oil around until it warms up.

Is 5w30 better than 15w40?

Probably not. 15w40 is usually used in diesel engines and has a much different additives profile. 5w30 is usually used in gasoline engines. … Gasoline oil doesn’t have the antiwear additives diesel oil does, leading to faster wear on your engine.

Which is better 15w40 or 20w50?

so a 15w40 is as viscose as a straight 15 oil at 40c, but only thins as much as a 40 oil would at 100c. a 20w40 just tells you it’s a little more viscose at colder temperatures than a 15w40, but thins the same as a 40 would at the higher temperature.

Will 5w40 hurt a 5w20 engine?

5W20 offers better fuel economy than 5W40 and some engines are optimised for using it and lubricating some parts. If you drive short distances only and engine remains cold, then using W40 instead W20 is not an optimal choice.