MOBIL DELVAC 1300 or DELO 400 ??

[tom sweeney]

ive used all 3 brands,and am currently on mobil delvac because its a little cheaper at walmart... . all 3 are very good oils IMHO.

... tom

 

[tjcoil]

they are both conventional oils

I don,t want to start an oil pi$$ing match here,but I am getting ready to change my oil & filter(fleetguard)for the first time. The mobil and the delo are the two that I am considering to use in my new cummins 2004. This is my first Diesel,so I want to do it correct. Thanks for any input. coobie

They are both good oils that meet CJ-4 requirements. But if you are looking for what's best for your motor you should always go with a flagship full synthetic oil like Mobil Delvac 1 ESP 5W-30. Mobil is backwards compatible so even though you're in a 2004 model this will still be your best bet.

 

[RustyJC]

The last post on this thread was over 11 years ago. I hope he's decided what oil he's going to use by now.

Rusty

 

[jfluffy2]

Found this here at the top of the page in Technical FAQ's, Good Information !!!!

Which engine oil do you recommend for my diesel?
A Many of you inquire about selecting the “best” for your truck. I hear a lot of questions like, “How about Mobil 1 or the Castrol
Syntec synthetic lubricants?” Good intentions, but these oils are not blended to meet the requirements of a diesel. The API
(American Petroleum Institute) “donut” rating for both oils is CD. Note the first letter “C” stands for compression engine (a diesel).
The “D” is the specification test the oil was tested at and was able to pass. The “D” specification was developed in 1952.
The most recent “C” or diesel specification is CI+4. In 2007 it changed again to CJ. Is the CJ specification better than CI+4? Good
question and Issue 54 through Issue 59 had a lengthy discussion on why CJ may not be better than CI+4. If you have a new
6.7-liter HPCR engine, you will want to read about the CJ oil. Owners of trucks built prior to ’07.5 will want to continue with the
CI+4 oil ... if you can find it. We revisited the lube oil story in TDR Issue 76. Join the TDR and read about the latest updates.
The oil also needs to also pass the API S (S stands for a spark/gasoline engine) category and current specification J. The S
classification is needed to address and prevent wear on the sliding camshaft tappets.