Oil for your 2007-2008 Diesel

[Rudolph]

Which oil do you use? Iam looking to help my milage. Some people use 5W40 and some use 15W40 has anyone tried both and checked milage? They tell me you must use CJ4 for the ISL engine. Any coments will help. Thanks

[Rudolph]

Which oil do you use? Iam looking to help my milage. Some people use 5W40 and some use 15W40 has anyone tried both and checked milage? They tell me you must use CJ4 for the ISL engine. Any coments will help. Thanks

[Route 66]

You must use CJ4 in a 2007 and later emissions engine.

In addition, I would stick with Cummins recommendations while under warranty and I don't think you'll notice much difference with a different oil.

[Techie]

Stay with the Cmmns recommendations.

Doubt that you coudl run eneough miles over the life of the engine to make a measurable difference with an RV.

[Chickadee]

Hi Techie: Literature has me confused..(as usual). What IS the recommendation for a Cummins ISM 500. I currently would use Rotella 15W-40 but can't find the reference on jug to "CJ4" only a ref. to "CG4" Is CG4 wrong to use, or is CJ4 a misprint in above posts??

[Rudolph]

I had work done on my engine at cummins they said to make sure you use CJ4. Got mine from Cen-Pe-Co.

[rotts4u]

This is from Shells website


Shell's most advanced formulation for our most advanced protection.



New Shell ROTELLA® T with Triple ProtectionTM technology is our most significant advancement in heavy-duty motor oil in 30 years. It meets or exceeds API CJ-4 requirements, and is designed to provide extra performance while helping to maximize equipment utilization and minimize cost of operation and lubricant ownership. And of course, new Shell ROTELLA® T with Triple ProtectionTM performs well in both older and new engines.

On average, 50%* lower wear in seven key industry testsUp to 38% lower wear in over 5.5 million miles of on-road testing in current engines30% increase in active ashless performance chemistry to protect against deposits and sludgeDesigned to protect and maintain exhaust aftertreatment systems on new trucks

[Chickadee]

G'morning rotts4u!! Thanks for info. Looks like it'll have to be CJ4, and, I'll have to give away my 3/4 full gallon of Rotella CG4 that I kept when we changed rigs. Thanks again. Steve

[rotts4u]

Can you use it in the Genny? Or your car/ truck, lawn mower etc?

Frankly I would not worry about having 3 quarts of non CJ-4 in a crankcase of 24 quarts total but that is just me.

[Gary RVRoamer]

CG4 is old stuff - your store has had it in the shelf awhile. There was CH4 and now (since 1/1/2007) there has been CJ4. Nothing wrong with it as far as age is concerned, but the specs have been advancing steadily and your new engine absolutely requires CJ4 spec oil.

I stick with 15W40. There is no need for 5W unless your run in very cold weather (below zero)

[Bigblock]

My diesel technician belives that Scheaffers oil Supream 7000 15w40 is the finest oil made for diesel engines and has crankcase life of a thousand miles per quart of crankcase capacity.Sounds amazing,it is.Check out their website at Scheafferoil.com.and yes it is CJ4 rated and beyond.

[Bigblock]

The correct spelling is;Schaefferoil.com.