Aran is correct. Back then, there were no detergent additives in oils, and
there is a good possibility that crud can get released back into circulation
once the strong additives of the synthetics start acting. However, if the
engine has been recently rebuilt, a high viscocity synthetic can be used
safely. Synthetics with various grades of viscoity are available. I use 15w50
Mobil 1 on my 440's which has probably higher hot viscocity than the original
oil used in the 50's hemis.
D^2
Quoting "A. Foster" <monkeypuzzle1@xxxxxxx>:
> Denis;
> Unless your engine has been torn down, boiled out, and rebuilt, I would use
> single weight conventional motor oil. Using synthetic on a 50 year old
> engine is asking for trouble. For one thing synthetic is too thin for the
> tolerances that are likely to be encountered. For another it might dissolve
> some coagulated crud in the block and block an oil galley causing real
> problems.
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