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Gerald,
I'm sure you will get conflicting opinions on this issue, but I have always
gone to a heavier weight oil instead of synthetic on older or abused
engines. It seems much of the usage is really leaks at the crank seals,
front and rear. If she's in Ohio, where they have real winters, don't go
too heavy---say 20W-50. I have little respect for oil additives, but some
swear by them. I've heard the rumors about changing oils causing burning of
oil, however I believe that that was if you switch from say the old paraffin
based oils (like Ammale) to a high detergent oil that cleans better and
doesn't coat the "innerds" of an engine with a varnish like coating.
Ammale, (or however you spell it), coated everything, the oil stayed clean
and everybody liked it in the 50s, including by Dad, until they discovered
that it wasn't doing its job dissolving the carbon and sludge formed by the
normal wear of bearings, rings, lifters, etc. Switching to an oil like
Castrol then would clean and keep cleaning until the varnish-like coatings
were pretty much gone leaving more clearances than originally designed for
the engine. It is not that I don't believe in synthetics. I use it one of
my daily drivers because that was recommended by GM. It's just that it's
expensive and to my knowledge there is no evidence that it heals or stops
the burning of oil in an abused engine. That's my thoughts. Wait for the
others.
Don W. Carter, AIA
Carter Design Associates
6213 Skyline Dr., Suite 100
Houston, Texas 77057
(713) 529-2288 Telephone
(713) 789-2330 Fax
don@carterdesignassociates.com
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