Engine Oil

[MartyC]

Question: I know Indmar says use the Pennzoil 15W-40 Marine Oil. Someone else told me it was just as good to use regular Pennzoil 10W-40. Any thoughts?

[Yellowmobius]

Yeah, void warrenty!

I use Amsoil marine grade, I don't care for the penzoil

[Catdog1]

Been using Penzoil 15W 40 "Longlife" from WalMart. Somewhere on the board we determined last year that the Marine grade wasn't necessary.

Why would you prefer 10W? Availability?

Marty,last year I e-mailed Indmar,and told them I could not get Penzoil marine oil locally.They told me it was fine to use the 15w40 heavy duty oil.I printed the reply and am saving it.

test

[james yarosz]

Last year I e-mailed Indmar and told them I could not get the penzoil marine oil locally.They told me it was ok to use 15w40 penzoil heavy duty oil.

[james yarosz]

This year I'm going to Amsoil 15w40 synthetic marine oil.

[carsondoc]

15W-40 oil will have the viscosity of 15W oil when the engine is cold and that of 40 oil when the engine is warm. The "W" indicates that the oil is desirable for use in winter driving conditions. The Indmar manual recommends using 10W-30 Penzoil Marine if the engine will be used below 20 degrees. I have not been able to determine if "Marine" oil has some additive that regular oil does not. However, most oils have rust and corrosion inhibitors already in them and this should be a closed system.

Anybody out there been running the readily available 10W-30 or 40 for a long time in their engines? Any problems?

[BensonWdby]

Most of the 15W-40 I have found around here appears to be designated for use in Diesel engines. The guy at the NAPA store recommended against it in a gas engine.

I have a source for 15W-40 Marine Penz so no problems.

[MartyC]

Found the Penzoil Marine at Wal-Mart so I stayed with that. Hard to believe I called all over town looking for it and ended up finding it at the local Wal-Mart.