Gentlemen,

I appreciate and thank you for your responses, most informative and I have
learned a lot.
Once again, many thanks and regards
Mark Zak


"Mark Zak" wrote in message
...
Can I use Mobil 1 5W-50 SuperSync oil (100% synthyhetic) in Mercruiser GM
V-8 350CID (5.7 L) in 15 year old marine engine? The manual specifies
detergent 20W-40 or 20W-50 oils. What effect could have the 5W-50
viscosity range (5W vis 20W)? The vessel is not used often, is stored on
hard stand, the winter temperatures are hardly below 10 degrees C and the
engine is run at least once every month for about 10-15 minutes.

Appeciate your thoughts
Mark Zak