Originally Posted By: tig1
Originally Posted By: RedOakRanch
600 miles on car now and at 80F outside the oil was running 224 constantly. On about 5 miles of an 8% grade at 65mph it ran up to 240F. I'm not liking how quickly it climbed. I'm wondering if it would have gone higher if the grade were longer? I know most synthetic oils can handle up to 300F but I'm starting to worry about my 0w20. If I actually drove long distances through mountains and I'm going to be approaching 250F I think a 30 grade oil might be better? What do you guys think?
How about heavier grades producing slightly higher oil temps.
Sure , heavier grade of say 0W30 may produce higher oil temps than a 0W20 , as it 'should' be
the case .More so when both scenarios encounter same levels of boundary lubrication regimes in
the engine operation.
Having said this , I estimate viscosity of a typical 0W30 at
252F could be equal to the
viscosity of a typical 0W20 at
240F.
More over , HTHSv @150C of a typical 0W30 (API specs minimum 2.9 cP) should be higher than HTHSv
@150 of a typical 0W20 (where API specs minimum 2.6 cP)
Hence , higher margin of safety in engine wear protection .
Well , OP would be in the best position to validate oil temps of xW30 and/or 0W40 under best-
effort identical conditions for real field results for comparisons and evaluation.....