x-no-archive:yes "Keith" wrote:

I kinda doubt it for an engine that old. For one thing, it's viscosity is
lower than what you're probably using right now, so you might use more. It
also might break a lot of gunk loose. For an engine that age, I'd just stick
with regular mineral oil and a good change interval. Oh yea, and Wix filters
if you can get them. None of that Fram crap.

We used to think this too, but we don't have anything BUT old engines
and we've not had that problem. The last new car we bought was a 1974
pickup. Our current cars that we are driving are all older than 1985,
and the boat is a 1979 - bought used and synthetic put in them ASAP.
One of the outboards is from the 50s and the other is probably very
early 1980s.

Do agree about using good filters though. We use the Amsoil filters
too or Hastings which are the same.

Now for a relatively new engine, I'd swear by synthetic. Have used it in
several cars and it's fantastic. Matter of fact, Corvettes come with pure
synthetic (Mobil 1) from the factory.

For a diesel, there are some synthetics specifically for diesels (CI) like
Amsoil. I think Shell makes one as well, just make sure it's for diesels. If
you really want to go whole hog with your system, install a bypass
filtration system, like the one from Amsoil or the Gulf Coast Jr. and as
long as you test your oil, you'll probably never have to change it again,
just top off occasionally.

grandma Rosalie
http://www12.virtualtourist.com/m/4a9c6/