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Old May 25th, 2020, 17:38   #24
Veteran Member
Join Date: Mar 2014
Location: St.Paul, MN
TDI(s): 02 golf ALH
Fuel Economy: 42 stock, 47-49 now

Originally Posted by travis45 View Post
IBW, when you say the top number, do you mean first or second? The 5 in 5w40 or the 40?
the first number is tested at 32f, the second at 212f
the numbers are more or less just relative, not relating to any easily quantifiable unit

so at 32 degrees f, 0w50 is thinner than 10w30
but at 212f, they've changed places

also, when converted into more rational viscosity units like centistrokes or whatever, even a 0wXX oil at 32f is still significantly thicker than an XXw50 oil at 212
so you've no need to worry about going too thin with the "cold" number

ETA: for my input, I've been running t6 0w40 in the compound turbo golf, 18k miles since the last drain, but it has burnt 2 gallons in that time so that's as good as changing it IMO. Spun a filter on 8k ago, gonna do the next at 10-12 after having cut open the last one to find it looking fresh and clean

Last edited by [486]; May 25th, 2020 at 17:40.
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