On Thu, 9 Oct 1997 12:03:04 -0700 mdstockr <mdstockr@NEO.LRUN.COM>
writes:
>With a 5w50 oil, the base stock is 5W with modifiers to make it act
>like its up to 50W
>at higher temperatures.
>
>The problem is, these modifiers break down over time, even in as
>little as 2,500 mi.
>Once this happens, you basically have base stock oil, in this case 5w,
>which is too
>thin for pre-1990 engines
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As I understand synthetic oils are designed to overcome this very
problem, which is why they protect longer and better....and cost much
more.

Any petroleum engineers out there??

Steve and Jo Ann Wacker
San Marcos, Ca.
90 Carat
86 Syncro