Has anyone used synthetic oil in their older mercs. I heard that they smoke less with the synthetic. But the question still remains will it hurt the older merc motors as in my vintage? 1976.
Jet, I have used a synthetic-blend in my '77 Merc 1500. it smoked a bit less than regular dino oil, but the smoke was not as sticky. Consequently, I smelled less like smoke, as well.
Pennzoil full synthetic would be pretty hard to beat in any stock 2 cycle engine. Probably wouldn't allow a rebuild job to break in, but once an engine is at peak compression, it'll keep it there much longer than dino oils.
