I have twin 2002 VolvoPenta 5.0 GXi (270 HP) Gasoline engines (Chevy 305 block) in my express cruiser. The VP owner's manual recommends SAE 30 synthetic oil (their brand of course), or 20W50, or 15W50 Synthetic oils. The manual also states "Use single viscosity oils in markets where available. The use of multi-viscosity oils, such as 10W30 and 10W40, is not recommended unless single viscosity oils are not available."
I find this very odd. Mercruiser, which sells the same basic engine (sourced from GM), recommends dino 15W40.
My question is: would Shell Rotella Synthetic 5W40 be a decent choice for these motors? They are used almost excusively on weekends, for only short periods at a time, and run very cool (140-160). I really hate to put a thicker oil in there since they are not run daily (i.e. oil starvation at startup), for long durations, or at high temps.
Thanks in advance.
[ June 25, 2003, 01:15 AM: Message edited by: DockHoliday ]
I find this very odd. Mercruiser, which sells the same basic engine (sourced from GM), recommends dino 15W40.
My question is: would Shell Rotella Synthetic 5W40 be a decent choice for these motors? They are used almost excusively on weekends, for only short periods at a time, and run very cool (140-160). I really hate to put a thicker oil in there since they are not run daily (i.e. oil starvation at startup), for long durations, or at high temps.
Thanks in advance.
[ June 25, 2003, 01:15 AM: Message edited by: DockHoliday ]