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Well, in the summer months I don't see a problem w/ 15-40. Come winter a 10 or even 5 30 might be in order. I'm not such a big fan of the 10/5-40's as they require too many friction modifiers to reach that sort of spread..
I like to take it Easy for those first 2K miles just to be Sure everything polishes itself in perfectly.. This engine is going to be under relatively high stress all it's life..ideally give it the best chance possible of working properly for all of those miles.
After about 6-8K I'd make the switch to synthetic were in my car.
Have Fun!!!
Jonathan
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