Synthetic or Not

[Rock Hall]

I just finished my 20 hr break-in on my Merc 350 Reman. Used Pennsoil 10-30 at 10 hr oil change. I run Mobile 1 in all my other vehicles. Whats the experts' opinion on Synthetic in marine engines? The only thing different with this motor is it has Roller Tappets.

Rock Hall

 

[Don S]

Re: Synthetic or Not

 

[Bondo]

Re: Synthetic or Not

Ayuh,.......... I've been running Mobil 1 in my 4.3LX for the last 640+hrs,+ the compression check was Excellent,.......

I'm going to Stick With It,......

Oh,..... That's Mobil 1, 15W-50............

 

[Bondo]

Re: Synthetic or Not

Btw,.........
I'm running Penzoil 75W-90 full-syn in my Alpha drive for those same hours,.......
Only because my local supplier carries It,+ Not the Mobil 1 75W-90...........

Good Luck...........

 

[Rock Hall]

Re: Synthetic or Not

ok
Thanks for the suggestions. I'll have to see what is available. Fromthe buletin, dounds like a 25-40 Mobil 1 will be fine, if there is such a thing,

 

[Chris1956]

Re: Synthetic or Not

Rock Hall, You do realize that standard Multi-Vis oils such as your 10W-30 are not recommended.

On a related note, I had heard that the Quicksilver 25-40 Oil is formulated in a different manner than the automotive Multi-vis oils. I had heard that it was actually a blend of both 25 and 40 weight oil, rather than an base stock with additives to provide the multi-viscosity behavior.

On a further related note. Why is Mobil 1 OK to use in a Sterndrive engine? Isn't is just a synthetic version of the automotive multi-vis oils? I notice that Mercruiser doesn't recommend it.

 

[bruceb58]

Re: Synthetic or Not

Quicksilver 25-40 is not synthetic but you are correct that it is different than most auto multi-vis oils in that it does not use viscosity increasing products. Neither does Mobil 1 synthetic.

Mobil 1 does not come in 25W-40 but does come in 15W-50.

 

[Purduebarry]

Re: Synthetic or Not

Fresh oil lubricates, keep it clean and fresh and it will do it's job. If it makes you feel good buy the brand you like. Most auto makers are going to synthetic blend, best of both worlds. Dirty oil doesn't lubricate well, don't change it and brands don't matter much.