What happens if I use 10W40 instead of 15W40?

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. The winter viscosity number dictates cold-start performance. 10W40 oil will perform cold starts better than 15W40 oil.

Can I use 10W40 oil in a diesel engine?

If the oil is rated something like “SN/CK-4” then you can use it in either a gas engine or a diesel. If it doesn’t have a gas engine rating, that usually means there’s too much phosphorus in it.

Can I use 10W40 instead of 20w40?

A 10 W 40 oil will have the viscosity of a 10 Grade oil when cold and that of a 40 Grade oil when hot. A 20 W 40 oil can replace a 10 W 40 if your winter / cold temperatures are not too low. A 10W 40 will afford better lubrication and performance over a wider temperature range than a 20W 40 oil.

Can you put 10W40 in a 15W40?

There is absolutely no harm in mixing different grades of engine oil! All motor oils are required to comply with international standards which include a compatibility test. This means that any branded engine oil will mix with the standard test oil in any proportions and the mixture will still perform as specified.

Which oil is thicker 10W40 or 15w40?

When it’s cold, 15W40 is only heavier than 10W40. The thickness over temperature is referred to by the two numbers. They are the same weight in hot weather.

Which is thicker 20w50 or 10W40?

10W40 is not better than 20W50 for high mileage. The difference between 10w40 and 20w50 is simply that the latter is thicker.

What oil is thicker 10W40 or 15w40?

Can a 15w40 oil be used for petrol engines?

Shell Helix HX5 is a conventional (mineral) oil with viscosity 15W40 meant for gasoline and diesel engines. So 15W40 CAN be a choice of oil for a gasoline engine if the manufacturer recommends or allows it. Where can I find the best full-time remote developers?

Can you use motor oil in a diesel engine?

Our Answer: In most cases, you should not use a motor oil designed for gasoline engines or passenger car service in a diesel engine.

What kind of oil should I use in an old car?

I have actually heard that some of the newer oils are not as good for older engines because of the reduction in zinc content. While this probably isn’t an issue in most engines from the past 20-30 years, it appears to be with older classic cars, especially ones with flat tappets.

Do you need ZDDP for a diesel engine?

New engines have roller tappets and don’t need the zddp. Older engines, pre-2000 or so with sliding cam followers will experience excess wear with car oil. Diesel oil meets the older car specs, as @cwatkin posts, so it will work fine in engines needing at least that spec oil.

Which is better 10W40 or 15w40 cold start oil?

A 10W40 oil will be thicker in the cold than 15W40 oil, but they will have the same viscosities at higher temperatures. The winter viscosity number dictates cold-start performance. A lower number indicates that the cold oil will be thinner, hence applying less static friction on the engine, and less drag. Oil settles at the bottom of the engine

Can you use diesel oil in an older car?

Older engines, pre-2000 or so with sliding cam followers will experience excess wear with car oil. Diesel oil meets the older car specs, as @cwatkin posts, so it will work fine in engines needing at least that spec oil. The ratings started at “A” and have progressed to SN.

What happens if I use 10W40 instead of 15W40?