Engine Oil viscosity mixing?

[boatdude100]

Winterizing time. 3L 2007 Volvo Penta
Have leftover SAE 30 synthetic as specified in manual. Can I mix this what the marina recommended which is 25/40 synthetic? Do we agree 25/40 is a good viscosity for 3L carb'd engine? (Canada)

 

[Scott Danforth]

I would run Rotella 15W40 diesel engine in your flat tappet cam motor

 

[jimmbo]

If Volvo specs SAE 30 Synthetic, they have their Reason(s). However, is the 25/40 syn a Volvo or Mercury/Quicksilver Oil? If so, I wouldn't hesitate to use it

 

[boatdude100]

Is it ok to mix the two- SAE 30 and 25/40 synth?

 

[jimmbo]

The Oils are mixable, you will just end up with that is a Bit more Viscous when cold, and a little less when warm.

 

[boatdude100]

If Volvo specs SAE 30 Synthetic, they have their Reason(s). However, is the 25/40 syn a Volvo or Mercury/Quicksilver Oil? If so, I wouldn't hesitate to use it

yes it would be one or the other, both are available

 

[Bondo]

yes it would be one or the other, both are available

Ayuh,.... No problem,....