Unless the base stock is better for the 0W-30 than the 5W-30 or 10W-30, then the oils with the lower spreads will perform better in hot weather due to less VI improvers. But M1 0W-30 has a higher flash point than M1 5W-30 (suggesting a higher quality base stock - more high temperature stability), so I don't know why jsharp had consumption problems.quote:
Originally posted by Roger:
Everyone talks about the advantage of 0W30 in cold temperatures. But what about when it's hot?
Yes, it was one of the early formulations of 0W-30. Since then I've beed satisfied with 5W-30 so I've never bothered to try it again...quote:
Originally posted by rpn453:
Unless the base stock is better for the 0W-30 than the 5W-30 or 10W-30, then the oils with the lower spreads will perform better in hot weather due to less VI improvers. But M1 0W-30 has a higher flash point than M1 5W-30 (suggesting a higher quality base stock - more high temperature stability), so I don't know why jsharp had consumption problems.quote:
Originally posted by Roger:
Everyone talks about the advantage of 0W30 in cold temperatures. But what about when it's hot?
Maybe it was an older formulation?
I guess Noack would be a better indicator. I didn’t think of that immediately because that test is not included on data sheets as often as I’d like to see. But I think flashpoint still has relevancy: a higher flashpoint usually corresponds with a lower Noack value. They are both based on volatility.quote:
Originally posted by TooSlick:
Flashpoints really aren't that relevant to oil consumption. What you will find is that the 0w-30 and 0w-40 grades normally have a higher Noack volatility than the 5w-30 and 10w-30 grades. The Noack test tells you how much oil evaporates under controlled conditions and is a much better predictor of oil consumption.
TS