In addition to loosening lots of old crud, they advise not to
switch to synthetic oil in an old engine because its likely to cause
leaks.
John
----- Original Message -----
Sent: Sunday, June 01, 2003 4:33 PM
Subject: Re: IML: 1953 imperial
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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