Scarab Billy

What weight and type of oils do you guys run in your big blocks. I am running a straight 30 right now...but have been told its not enough. Synthetic would probably be my next choice, but I'm unsure about the break down factor.

frantic

Straight 30 is great or u can go with 25-30 weight which is a bit lighter. i would stay away from the synthetic unless u have a newer engine or u plan on burning synthetic for the future and never changing back to non synthetic..

Knot 4 Me

Happy reading...

http://www.offshoreonly.com/forums/g...brication.html

I've used 15W50 Mobil 1 for over 10 years and hundreds and hundreds of hours.

mike tkach

iTrader: (3)

frantic,where did you get this information?you are incorrect,you can change from synthetic to mineral and back all you want,if i am wrong,please show me facts.

Rockfish71

mobil delvac 1300 super 15w40 wally world 12 dollars a gallon. I run that in my power stroke too.

jeffswav

I run Amsoil 15/40 Marine.

frantic

Hey Mike,

I am speaking from personal experience. My 96 Z71 chevy 305 started leaking oil from the engine seals. I guess the new sythetic's are a better grade of oil mixed with minerals. I am not the one to steer someone in a direction that I wont go. Anyway if you tried it please keep me posted. Dont want my seals to go bad on my marine motor.

Thanks on the input..

frantic

Depending on what year engine you have. If your engine is 2000 and newer i would use synthetic or mineral but if your engine is older than 2000 i would stick to either mineral or synthetic only!!

PatriYacht

There are many people here running synthetic oil in their pre 2000 boat. Mobil 1 15-50 is very popular. Mercruiser reccomends 30 wt for cold climates only. For normal summer temps 40 wt is reccomended or Merc oil which is 25-40. Frantic needs to do a little more research. There is a lot of info here for a new guy.

TylerBurich

Only amsoil 25-50 high zinc formula for my hydraulic flat cam 420hp's!!!