ORIGINAL: nrad2000
I've been using Power Master 15%. It's part synthetic and castro. Can I use Full Synthetic on my 46 size motor? Like Cool Power 15%?
if its an abc i wouldnt, if a ringed and its been broken in you could but i still wouldnt.
why would you want to switch? and to what brand?
castor oil is your friend, its a little messy but it helps keep your engines rust free and is a better lube than synthetics (here in the USA)