The 10w-40 oil problems was because the oil was not getting to the lifters
and bearings fast enough on cold-startup. So you tended to get a diesel
sounding knock, which is bad for both parts if it happens too frequently.
I had a tech bulleten from GM that explained this sort of thing happening
on 454 and 502 engines, and advised against the use of 10w-40 and 20w-50 on
street 454's, and not to use 20w-50, 20w-40, 40w, 50w etc. on 502's unless
it was a purpose built marine 502 (as opposed to the street 502 crate
engine).
-----Original Message-----
From: Adam Altman [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, April 10, 2001 1:16 PM
To: [EMAIL PROTECTED]
Subject: Re: flushing radiator
Funny, b/c wasn't GM the one who started this stuff?
Ever notice you cant use 10-40 oil in a lot of GM
engines because it will make them knock? I've never
understood that one either.
Adam
--- Kevin Hawkins <[EMAIL PROTECTED]> wrote:
I've heard some bad things though
> about it's use in GM
> products. Then again, I've heard some bad things
> about GM products in
> general! :^)
>
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