Just seeing what you guys might recommend in brand and weight for a 6.2 (383) mercruiser MPI
Thanks

Merc 25-40w syntehtic

I really like moble1 v-twin 20w50. Available at Walmart

Spectro Golden Motoguard semi-synthetic 20w50.

Tons of anti-wear additive.

Ken

Ken, cleaning out a buddies barn (who sadly passed away last fall) and found a couple cases of old Spectro 2 stroke pop top cans. Is it still safe to use? Thanks, Kurt

Man thats got be old. I used that in a dirt bike when I was 12 and that's been a bunch of years ago.

Really not a lot of need for a multi-weight oil in a boat. That being said (I have ran about everything in mine but) I currently run rotella 15/40 with some zddp additive (stp). I change my oil so much that i feel there is no need to run synthetic.

Brad penn. 20w50 and 10w 40 mixed 50:50

Been using the M1 V-Twin 20/50 for about 10 years, but in 500 to 700 hp engines. Seems like overkill $$ for a stocker. If I had a stock 6.2 I'd likely follow wannabe's suggestion and go with the synthetic Merc 20/40, or equivalent.

+1 I have a 2006 360 Mag MPI engine and I run Mobil 1 15W-50 from Walmart About $25.00 for a 5 qt jug