"JAXAshby" wrote in message
...
rod, are you saying that racers deliberately use poorer quality oil than
the
englightened owner of a mercruiser powered bayliner?

Who said the racing oil was poorer quality? I sure didn't. I said that
racers prefer to use an oil formulated for racing because they believe it
won't foam up as bad. Ask the typical racer why standard oil might foam up
and you might really shake your head at the answer. Note that these would
be the same people who tell you that you shouldn't set a battery on the
ground.....

I attended a seminar once that was put on by Pennzoil targeting a group of
race car owner/drivers. This was about 30 years ago so things might have
changed a little, but the gist of what they said back then was that the
racing oil was formulated to withstand higher temperatures and to resist
breakdown if contaminated with Nitromethane or alcohol. It was NOT a
"detergent" oil and they did not recommend it for the family car.

Oh, and in a previous post you said:
" tell us which major oil companies produce oil specifically for
use in 4-cycle gas engines used in a marine environment, and how that oil
differs from the same company's oil produced for the same engines used in
say
highway driving."

I can't tell you how its different, and I suspect that the only difference
is the word "MARINE" on the bottle, but Pennzoil sells a Marine oil.... :
http://www.pennzoil.com/products/mar...ycleHDoil.html


Rod