Can I substitute 10W40 for 15W40?

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.

Is 10W40 the same as 15W40?

The viscosities of a 10W40 oil will be the same as those of a 15W40 oil, but the temperature difference will be greater. Therefore, a car will start with fewer cranks when it is holding less oil in the winter. Cold starts will be better with 10W40 oil than with 15W40.

Which is better 10W40 or 15W40?

A 10w40 oil will be thicker in the cold than 15w40 oil, but they will have the same viscosities at higher temperatures. So during the cold season 15w40 being the lighter weight engine may provide better fuel efficiency provided that the engine can sustain thinner and lighter oil.

What happens if you mix 10W40 with 15W40?

No, it is not ok to mix 2 different oils. Both oils will have different consistency, different viscosity else the oil manufacturing company would make only 1 grade of oil for all purposes. It will damage the engine to an extent that you’ll have to junk the engine completely.

What temperature is 15w40 good for?

The main differences between 10w40 vs 15w40 are in the temperature range of the oil and its viscosity at 100° C or 212° F. For example, 10W40 means that it can be used at temperatures not lower than -20° С or -4° F, and 15W40 not lower than -15° С or 5° F, and both engine oils can be used at 40° С or 104° F.

Is it OK to mix 10w30 and 15W40?

you can mix the two without a problem, for Wisconsin, the 15w 40 would be a better oil in the summer and 10w 30 would be a better oil for the winter, if you drive the car in the winter! I have Rotella 15w40 weight oil in my LT-1 now and I just found a place that sells 10w30 which would be a better choice.

Can you mix different 15w 40 oils?

THE ANSWER IS NO! Even if two different brands of oil have the same viscosity, you still should not be mixing them together.

What is the temperature range for 10W-40 motor oil?

Here’s the recommended ambient temperature range for each oil grade, in general: SAE 10W-30 motor oil: -25°C (-13°F) to 30°C (86°F) SAE 10W-40 motor oil: -25°C (-13°F) to 40°C (104°F)

When should I use 15W40 oil?

When Should I Use 15w40 Oil? This ADVANTAGE 15W-40 HEAVY DUTY DIESEL ENGINE OIL is suitable for use in over-the-road diesel trucks, off-road diesel equipment, farm tractors, and passenger cars and light trucks with diesel, turbo-charged diesel engines, or gasoline engines.