View Full Version : Type of oil for 1995 Maristar with Corvette LT-1

07-15-2011, 09:49 AM
This may be a crazy question but I just bought a 1995 Maristar 225 and when I went to change the oil it said "special engine oil required, see owners manual". So after looking in the owners manual (10 times) it only gives capacity (4-5 Quarts) but no oil type. Can anyone fill me in on what type of oil the Corvette LT-1 engine takes?. Thanks!! Tim

07-15-2011, 02:05 PM
I believe i own the same boat as you but mines a vrs 220 ? if so i jst used synthetic oil bought at canadian tire

07-15-2011, 02:51 PM
It will do fine on any automotive oil from 10W30 on up to like 15W50. MC reccomends 15W40 in most all applications (diesel engine oil) due to it's better performance in high load applications (like a boat).
Asking which is best is like asking whether one perfers blonds, brunettes or redheads really!
The main thing is that you change the oil and filter regularly.
Personal preference 15W-40, whatever flavor is on sale. Use it in the boat, diesel pickup, old Jeep and any other 4stroke engine I have to fill up with the exception of the quad because it has a wet clutch that requires spcial additives in the engine oil to preserve the clutch life.
Ran my LT-1 on mostly 15W40 and a couple oil changes of 10W40 or whatever was on sale for 500hrs, ran like a top, burned no oil, perfect compression when I sold it.
Oil filter Napa/Wix Gold 1069, but use anything EXCEPT a Fram filter.

Table Rocker
07-15-2011, 03:13 PM
The manual for my '96 ProStar recommends "SAE 20-50 Racing Oil" for the LT-1.

07-15-2011, 05:14 PM
My 96 also recommends 20/50. Castrol GTX makes it.

07-15-2011, 06:43 PM
Thanks for the fast information! 15W40 is will be. Thanks again. Tim

07-16-2011, 11:42 AM
Thanks for the fast information! 15W40 is will be. Thanks again. Tim

20W50 is good too.
Again, pick your favorite flavor and roll with it.
Not sure why Indmar would reccomend the fancy 20W50 as the LT-1 is still a typical 5.7 iron short block, just w/alum heads. Everything that is getting oiled is essentially the same as the other 10 million chevy 350's.