Oil Change '98 Monsoon

[phishfan]

I've read all of the forums on the topic of oil changes and it seems that the 15w-40 is the standard, however, the original manual that I have says 20w-50.

I live in Ontario, Canada so I need to know which one to use. I suppose to I could just call an Indmar dealer, but I think the community here is way more savvy. Our Canadian Tire carries the Rotella T 15W-40.

Thanks

Edited September 16, 2008 by phishfan

[medicdiver]

My monsoon calls for 15-40w. An older engine may call for heavier oil. Just follow the manual and you should be ok.