What Is the Difference between 10w30 and 10w40 Oil?


The difference between 10w30 and 10w40 oil is the thickness or viscosity of the oil. At cold temperatures or when an engine is cold, both of these oils operate the same. But at higher engine or environmental temperatures, the heavier oil, the 10w40, operates better.
Q&A Related to "What Is the Difference between 10w30 and 10w40..."
I'd use the heavier 10-40 or 20-50 in older cars, plus Lucas, and Liqui moly to make it last. Dave.
He didn't. You know that there were no cars back then. School just got out, and you're already bored, so you're asking silly questions. Why not go help your mama do some cleaning
With any multi viscosity oils the first #
The catalytic converter is a porous metal filter located along the exhaust line between the engine and the muffler. The metal matrix inside speeds the conversion of toxic emissions
1 Additional Answer
Ask.com Answer for: what is the difference between 10w30 and 10w40 oil
What Is the Difference Between 10W30 and 10W40 Engine Oil?
The oil in your car is pumped through the engine when it's running, protecting it from mechanical wear. Oil is sold in a variety of "weights," usually expressed as xWy. The difference between 10W30 and 10W40 oil isn't too big, but to understand it,... More »
Difficulty: Easy
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