On Thu, 18 Jun 2009 23:17:46 -0500, dpb wrote:

Stormin Mormon wrote:
Air cooled engines run a lot hotter. At least, that's what
my instructor said, when I took the small engine course.

Look at the manufacturer's oil spec's in comparison in terms of API
ratings...
Remember, higher API ratings do NOT translate to better lubrication.
They just meen a newer standard.SM oil is significantly inferior to SJ
for heavy duty applications, old engines, and "L" Head air cooled
engines. Don't know if any of the current crop of OHV small engines
has roller cams but I doubt it.