Replacement for API SF Motor Oil?

Question

My dad is trying to change the oil on his 1987 Bayliner Cierra that he just got. The engine is a V8 Cobra Engine. The problem is the engine specifically asks for SAE 30 API Service SF motor oil. Upon countless store hopping and a bit of research, we found out that API Service SF is now obsolete. I've also read that not all newer engine oils are compatible with API SF.

Would anyone know what kind of oil (API service) I could use to replace API SF?

Thanks!

Answer 1

Use "Meets or exceeds quality performance API SJ, CF-4, CH-4." Oils typically 25W40 synthetic. Or a straight 30 W synthetic blend



See:http://www.wholesalemarine.com/p/SIE-18-9400-2Q/

See:http://www.wholesalemarine.com/p/SIE-18-9410-4/Sierra+SAE+30+Full+Synthetic+Marine+Engine+Oil+5+Quart+Bottle.html?utm_source=feed&utm_medium=cpc&utm_campaign=google&gclid=CL7c3svj87MCFUWo4AodR1cAdw



Chances are his Bayliner boat only has a few hundred hours on the engine. Back in 1987, as a certified OMC Cobra Mechanic, we used SAE 30W SF oil. Not a multi-viscocity oil. That way there was never an issue or question with the warranty. However, I personally used 20W 40 Synthetic multi-viscocity oil in my personal boat engine. (Mobile 1) .



Marine engines (water cooled) work harder and at with a higher constant load that typical car engines. The concern is that the oil would thin and not provide sufficientt lubrication at warmer engine temperatures. This isn't true with synthetics. The typical 10W 30 in cars is desirable because cars are started in very cold weather (Sub zero).... Think Minnesota .......Boats are seldom used under such conditions.



The site above is just one possible source but they are the correct oils for your engine.

Answer 2

Sf Motor

Answer 3

When in doubt, READ the Owners Manual. DUH!!! However, I do agree with Richard C. As a rule of thumb, most any oils made AFTER the "SF" rating came out will work just fine. API (American Petroleum Institute) says that ALL oils that are produced afterwards will meet and EXCEED the "SF" rating. I've been through API courses and have the "Certifications" as proof.

Answer 4

After 75000 miles you should upgrade to a SAE 40. manufacturers recommendations is basicly a break in oil for new cars.