farmer13

I run 0-40 synthetic year round

Thundercraft

Need a bit more info then that. i.e. what brand of oil? It could be a Diesel oil that is also rated for gas engines.... or, you just dumped in a gas oil and want to change it out.

Currently I am running a 15w-40 synth.

floodlight

Thunder, it's Motomaster Formula 1 SAE 10w30 100% synthetic. The bottle has a seal "For gazoline engine".
My owner's manual states use only oils conforming to API Service CF-4 or CG-4. A sulfated ash limit is specified for lubrication oil used in Cummins engines. A maximum of sulfated ash content of 1.85 mass is recommended for all oil used used in the engine.
For 24 valves a SAE viscosity grade of engine oil for the expected ambient temp. range should be selected. I know the 10W30 if good for the temp. range that we will be getting. We drop to 44f* last again.
Is the oil I bought suitable for Diesel?
Do I need to drop another $90 worth of oil? This is confusing

PourinDiesel

If you want to go synthetic go out and get some 5w40 Rotella T synthetic. Runs about $20 a gallon in the US and will last you a good 7k miles or so with a light foot (and it is rated for Diesel and Gas engines as well).

Stay away from "gaZoline"

Busboy

Any oil we use in our Cummins MUST have the -4 or it's NOT approved for use in our trucks. I'm guessing the 10-30 doesn't cut it. I use a PetroCan synthetic I get from PetroCan truck stops, it's called Duron 5W-40 and costs about $24 a jug of 4L.

klx650a2

Co-op makes a REALLY good diesel engine oil thats Cummins rated. 0w40 CO-OP® D-MO* SL - Heavy-duty Synthetic Diesel Motor Oil.

http://www.wetaskiwincoop.com/Petrol...um_specs.htm#2

$5.00 a liter too. Good deal. Has a pour point of -57 Celsius. Man, I hate winter.

dj_souvlaki

i run 15w40 shell rotella all year round without any problems.

and last winter was really cold.

Western Rammer

OH man! dump the Crappy Tire oil. Good motor oil is the cheapest insurance you can get for your engine. If you want to save a few bucks, look up the bulk lubricants dealers in the yellow pages and make a few calls. Most will be quite happy to sell you good quality oil by the 20 liter pail. For Winter in Ottawa I'd really think about that 0W-40 synthetic. For the rest of the year, 15W-40 from Chevron, Shell, Petro Canada etc.

Randy.