kwtv38

Hi I live in Michigan and am getting ready to fire up my old 1989 chaparral 7.4 Mercruiser. The boat has been sitting for 6+ years. I was gong to run a cheaper oil just for the start up then put in some Mobil 1. Any suggestions on what weight to use? I was thinking 20w-50

beaver 3

For a cheap oil i run delo 15 40 it has all the good stuff in it for flat tappet cams. Alot of over the road guys run it.

Fenderjack

iTrader: (2)

Rotella T.. Run it in everything..


John jr

Black Baja

iTrader: (2)

My buddy has an older Wellcraft with a 7.4 he runs the cheapest SAE 30wt he can find. Motor has over 700 hours on it and the only thing he has done to it literally is change the oil and a set of manifolds last year. The motor does have a hard life cause he's always boating with guys that have fast boats and often ends up doing some long tows across the bay at 30 mph...

Pismo10

99 cent WalMart oil or $12.99 a qt VTwin, you will never know the difference. Basic engine, doesn't matter.

Pismo10

If you will look more closely...."Basic engine, doesn't matter" and this is correct. No racing motor here.

Pismo10

It is least understood because it does not matter in 90%+ of motors but everyone like to think it does.

motor

iTrader: (3)

A flat tappet motor that has been sitting 6 years qualifies for the 10% it does matter on

mike tkach

iTrader: (3)

i would use a oil that still has a lot of zink or add some zddp just because it has not been run in 6 years,jmo.if it was a 96 or newer i would not worry about the zink.

motor

iTrader: (3)

What he said................