Hi all:
I am very interested in this subject and decided to contact Shell directly
about this problem and their Rotella T oil as being a solution. Following
is the exact response I got back from Lubrication Engineer, MaryCarol
Boemmel of Shell: Dear John,
" Zinc levels are being lowered on almost all engine oils, but heavy duty
diesel engine oils, such as Rotella T, will continue to have higher levels
than the passenger car/gasoline engine oils. The Rotella T 15W-40 meets API
SL, SJ, SH and all previous specifications for gasoline engines. The 15W-40
viscosity is heavier than what is recommended for most gasoline engines, but
if you feel comfortable with it, then there should be no problem. Rotella T
15W-40 is recommended for and used in many mixed fleet applications. It
does have a higher antiwear level to protect the heavy duty diesel engines
and should give you a very good performance in this regard." So, there you
have it. My 289 hi-po was specifically set up by "Ohio George" Montgomery
to run with 20W-50 oil so the 15W-40 should not be a problem for me or, I
would imagine, most other Sunbeam owners with flat tappet camshafts. Just
my 2cents.
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