Originally Posted by R80
Normaly oil temperature above 120°C may become critical (depends on the used oil). The air-cooled engines reach often very high oil temperature - so I use an engine oil with 10W-60 or at least 20W-50 specification, to have some reserve.
A friend and I rode 2 GS's ('94 & '95) through parts of the Taklamakan desert on packed and not so packed sand roads where temperatures got to over 46c.
We had changed the oil to full Castrol synthetic 10w-60 in Urumqi
and never had any problems. We were not pushing the engined hard though. They were both fitted with the standard oil cooler.
7 years later and the engines have still not had a re-build and mine is now over 100,000.
Years ago an American said to me, "Oils cheap, engines aint" Never a truer word....
Nostradamus Ate My Hamster