Oil question
They are both a 40 weight oil. The 10w is the “seen” or rated viscosity when below 32ish degrees, as the W stands for winter. Multi-viscosity was the flashy term used way back when describing a typical 10w 40 or 5w 30 or similar. At operating temp…200 degrees or so…they both behave like a 40 weight oil. The 10w 40 will have better cold start characteristics obviously vs the straight 40 weight.
Thread Starter
On The Tree
Joined: Oct 2015
Posts: 142
Likes: 1
From: Memphis
They are both a 40 weight oil. The 10w is the “seen” or rated viscosity when below 32ish degrees, as the W stands for winter. Multi-viscosity was the flashy term used way back when describing a typical 10w 40 or 5w 30 or similar. At operating temp…200 degrees or so…they both behave like a 40 weight oil. The 10w 40 will have better cold start characteristics obviously vs the straight 40 weight.
Neither. I’d want to know what your engine builder set up bearing numbers at, then we could discuss rpm range, forced induction vs N/A, nitrous, vehicle weight, etc.
Tell us about the build. Personally I’d consult my engine builder before I even thought about coming on a public forum and getting 27 different opinions.
Tell us about the build. Personally I’d consult my engine builder before I even thought about coming on a public forum and getting 27 different opinions.
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Thread Starter
On The Tree
Joined: Oct 2015
Posts: 142
Likes: 1
From: Memphis
Neither. I’d want to know what your engine builder set up bearing numbers at, then we could discuss rpm range, forced induction vs N/A, nitrous, vehicle weight, etc.
Tell us about the build. Personally I’d consult my engine builder before I even thought about coming on a public forum and getting 27 different opinions.
Tell us about the build. Personally I’d consult my engine builder before I even thought about coming on a public forum and getting 27 different opinions.
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Last edited by grinder11; Jul 29, 2022 at 05:09 PM.
TECH Apprentice
Joined: Sep 2013
Posts: 355
Likes: 19
I ran 10/w/30 Castrol full syn on my last race engine, 582 BBC, 4.50's in a dragster on alky. Ran it 2 seasons, sold it and he ran it a season and a 1/2. He pulled it to freshen it up and when it was tore down you could still see where they checked the mains with a dial bore gauge. It looked brand new inside on all the bearings and cyl walls. My engine builder recommended 20W50, he was sure surprised when I told him the oil I ran.