Re: Type of oil used
I use what Manual #17 for my engine tells me to use Marine Engine Oil so I use Mercruiser 20W-50. Yes it costs a little more to use to but I only change it once a year.
Striaght from the Manual:
"Crankcase Oil
To help obtain optimum engine performance and to
provide maximum protection, we strongly recommend
the use of Quicksilver 4-Cycle Marine Engine
Oil. If not available, a good grade, straight weight, detergent
automotive oil of correct viscosity, with an API
classification of SH, CF/CF-2 may be used.
The following chart is a guide to crankcase oil selection.
Oil filter should always be changed with oil.
In those areas where recommended straight weight
oil is not available, a multi-viscosity 20W-40 (SH, CF/
CF-2) or, as a second but less preferable choice,
20W-50 (SH, CF/CF-2 ) may be used."