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babs1966
06-09-2011, 05:51 PM
I have a 350 lt1 and am looking all over for 15w40 motor oil all I can find is diesel motor oil in that grade, also is synthetic oil recommended. I need the oil for both the engine nd the tranny.

chawk610
06-09-2011, 05:52 PM
Yes, Dello 15w40... diesel oil.

76S&S
06-09-2011, 06:21 PM
syn is not recommended

gotta_ski
06-09-2011, 06:47 PM
Why do you say syn is not recommended?

Kummer
06-09-2011, 07:14 PM
There are several posts on this topic - Shell Rotella, Dello etc all good oil to use

ricford
06-09-2011, 11:09 PM
My 1996 LT1 recommends 20W50. I use Castrol GTX.

babs1966
06-10-2011, 12:10 AM
Who is Dello or did you want to write Hello. Why do they put diesel oil in a gasoline engine, it just doesnt see right.

babs1966
06-10-2011, 12:13 AM
I tried a search but didn't come up with much. I just want to be sure I am doing the right thing. The closest MC dealer is four hours away. It just doesnt seem right to put diesel motor oil in a gas engine.

FrankSchwab
06-10-2011, 12:36 AM
The Chevron Delo or Shell Rotella oils are fine for a gasoline engine; it is rated for auto engines (the "SL" rating) as well as Diesel engines (the "CI4" rating). They market it for diesel engines because auto engines have been going to lighter weight oils (my Civic insists on 5w-20), and because, for awhile, the Diesel oils had additives that were being phased out in auto oils because they caused problems with the catalytic converters (I don't think that's true anymore).

Anyway, the Rotella, Delo, Pennzoil Marine 15w-40 oils are all fine for your motor. If you want to run synthetic (Mobil-1, etc) feel free - they'll work just fine too.

/frank

rspiecha
06-10-2011, 02:16 AM
I run Royal Purple 15w-40 with synerlec. I do a oil analysis every oil change with Blackstone Labs. No problems with oil so far. I also run it in my Duramax and oil analysis shows no issues.

Rob

blackcreek
06-10-2011, 09:11 AM
I also use the recommended 20-50W in my 97 205 LT-1

76S&S
06-10-2011, 09:15 AM
Why do you say syn is not recommended?

Maybe a better way of saying it would be, "not necessary" but if you want to run syn it's your money.

As clean as my oil is at 50 hours I don't see the need.

rspiecha
06-10-2011, 02:51 PM
Owning a boat is all about spending money, just another thing to add to the list.

Rob

HDAVIS
06-10-2011, 06:20 PM
I have a 96 MC190 and even though the owners manual says 20W50, they now recommend 10W40. I use Castrol 10W40 every 50 hrs or once a year which ever comes first. I would not waste money on synthetic.

Thrall
06-11-2011, 01:55 AM
I have a 96 MC190 and even though the owners manual says 20W50, they now recommend 10W40. I use Castrol 10W40 every 50 hrs or once a year which ever comes first. I would not waste money on synthetic.

Yup!
And they're Chevy 350's. They'll run on old cooking oil if necessary and I used 10W40 a few times in my LT-1, no problem. 15W40 or 20W50 I believe is reccomended because the boat engines couldbe/are subject to more extreme loads than your avg daily driver.
Now I use 15W40 in damn near everything since I have a diesel pickup, the X2 reccomends it for engine and trans. Lawn mower seems to run fine on it. Snowmobile gear case (Arctic Cat) likes it. Buy the stuff by teh case when it's on sale.

psychobilly
06-11-2011, 09:16 AM
Shoot! You'd be better off ta buy a barrel of the stuff! Prolly save you a fortune!

slushpup
06-11-2011, 01:06 PM
Yup!
And they're Chevy 350's. They'll run on old cooking oil if necessary and I used 10W40 a few times in my LT-1, no problem. 15W40 or 20W50 I believe is reccomended because the boat engines couldbe/are subject to more extreme loads than your avg daily driver.
Now I use 15W40 in damn near everything since I have a diesel pickup, the X2 reccomends it for engine and trans. Lawn mower seems to run fine on it. Snowmobile gear case (Arctic Cat) likes it. Buy the stuff by teh case when it's on sale.

I agree, although my MC had service records showing synthetic since the day it was built.The added cost is really no big deal since I do my own wrenching,Less than 10 bucks more a gallon at the auto parts store.I used 15/40 in my old Century Resorter with the 340 Crysler marine engine,Ran fine it all comes out thin and black at the end of the season.....

HDAVIS
06-12-2011, 11:15 PM
Oops, I meant 15W40 not 10W40 Castrol.