Costco 15w-40

[Chad A]

Anybody who does their own oil changes use the Costco heavy diesel oil? At less than $10 a gallon it seems pretty reasonable but have not heard much about it in big motors. 
 

Definitely not worth the money saved if it cannot protect the big ISX!!

 

Thanks

[DrDon4u]

I get 15w-40 at TRACTOR SUPPLY, 5 gallons for $27 after rebate.

Don

[tcbrow]

Ditto, Tractor Supply.

[Rikadoo]

When Costco went to there brand oil i quit buying oil from them, as far as im concerened it is untested. I use Delo 15/40 an last time i bought it was from Sams club, they had it on sale. 

[1nolaguy]

FYI - motor oils are heavily regulated by the feds so look at the specs on the containers and compare. Often different brands come from the same place. I used to work for a Shell packaging facility where motor oil and grease were blended and packaged. We did mostly 5 gal. pails and 55 gal drums (for commercial sale and application). You would regularly see Shell containers followed by off brands move seamlessly down the line without change. Both brands would have the same specs (ie: 10W30). That said, the major difference between big brands and off brands is often just that the big brand may have additional additives or branded additives such as Textron addatives in Chevron products. Mostly the difference in cost is because of marketing.

[vito.a]

Costco diesel oil is made by Warren Distribution based in Omaha.  It meets the new CK-4 standards and is considered a quality diesel oil.  I have friends with new X15 engines using it with success.  

[Chuck B 2004 Windsor]

If I had a X engine, I would not use anything else except Shell Rotella.  But that is the only brand I would use in any other diesel engine.  Why take a chance?

[wamcneil]

Not exactly on topic, but here’s an anecdote that might be useful.
I'm not an expert on lubricant technology, but I work with laboratories and quality management in industrial manufacturing, including major manufacturers of base oils. One company I deal with is a blending and packaging company that formulates lubricants and other fluids for a broad spectrum of brand names and OEMs. Big oil doesn't really makes their own lubes; the name brands develop additive packages, pay for the certification of final product lubricants and then outsource the manufacturing/packaging. 

My boss was concerned about supply chain issues impacting the availability of his normal Rotella lubricants and asked me to inquire about a suitable alternative. Lots of potential confidentiality issues, so no specifics are discussed with these folks… but when I asked about diesel lubricants, they expressed approval of Rotella and suggested Exxon products as alternative. 
The base oils are a commodity, but additive packs are proprietary. 
Cheers

Walter

Edited February 12, 2022 by wamcneil