"Gene Kearns" wrote in message
...
On Thu, 07 Oct 2004 15:54:56 -0400, JohnH
wrote:



Also, must the oil be Mercruiser brand? Is there a basic difference
between
'marine' and other oils?


"Marine Oil is boutique oil and can have an additive package tailored
to the marine environment and usage characteristics of the engine.

Given the narrow temperature range that most people's boat engine will
see, any *quality* oil will suffice, if the proper weight is employed
and the oil and filter are changed frequently.
--



Though not about stern drives or inboard engines, the latest issue of
Trailer Boats Magazine (October) has an article with tests of various
4-stroke outboard oils which are mainly mult-grade oils and compares them to
popular automotive oils.

Bill Grannis
service manager