Highest vicosity 5w-20?

Joined
Oct 17, 2008
Messages
682
Location
ontario canada
the thickest occurs when you mix 50:50 5w20 and 5w30. that's what i do, and the engines love it. that way you can buy what's on sale, and not have to pay through the nose. i often will use a synthetic 5w30 with a conventional 5w20, because the 5w20 conventional is already a group 2+. some people refer to this mix as a "scooby snack". it works well even for engines that call for 5w30, because you end up at the very thin end of a 30 weight. in terms of just the straight 5w20, valvoline, or Napa (Ashland) is pretty thick. i'm sure there are thicker one, but i bypass the whole argument entirely by running a 5w25 - this results in a really awesome pour point, a good thin oil, but still robust enough to satisfy any worries that a 20 weight is "too thin and watery". Just be sure that both oils are of the same manufacturer and both are SM, and then there are no worries. if i plan on a really long OCI, and it's a long summer holiday drive, then start with a 5w30 synthetic. it will shear down to the 20 weight range by the time you're ready to change it out anyway.
 
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Joined
Feb 14, 2008
Messages
434
Location
MD
I thought Motorcraft 5w20 was close to a 30 weight. If you want a thin 30 weight, I think Havoline DS is the ticket. I think the numbers look something close to below. Havoline 5w20 8.0 Motorcraft 5w20 8.7 Havoline 5w30 9.7
 
Joined
Nov 16, 2006
Messages
1,022
Location
Long Island, NY
If you want to go a bit thicker, maybe try M1 0w30 Advance Fuel Economy. It's designed to flow easily through the engine and should offer the best of both worlds, cold performance and a bit thicker at operating temps than 5w20.
 
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