Join Date: Nov 2010
Location: Erin, Ontario, Canada
Re: Oil Question
They show the lower limit of the ambient temperature range, but no upper limit. I have noticed, even in automobiles that as they get newer, the first number in multi-viscosity oils has been getting lower. I suspect a number of factors are at play there, likely improving oil technology, tighter manufacturing tolerances, and a desire to get oil up to the cam and valve train quicker on start up. Since the first name in the manual is Castrol, can you order online and get the correct viscosity and spec?