JHZR2
Staff member
For a fleet of old Mercedes diesels and Cummins 5.9L engines. Any would be 15w-40. Which and why??
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There is another thread on here about hpl engine cleaner. People use "spec oil" from a lube shop and end up with a coked engine. Oil is being reformulated nearly annually. What's wrong with looking for reviews on recent oils?JHZR2 how long have you been on this site? You should know that any oil with the proper ratings from a major bottler will be more that sufficient.
Well… it’s because they’re all good. Like stated here:JHZR2 how long have you been on this site? You should know that any oil with the proper ratings from a major bottler will be more that sufficient.
I don't think you can buy a bad 15w-40. Use what's easiest to get or cheapest
So that kind of fits in the thought process in my thread on 15w-40 vs 5w-40 in my low use car.Delvac Extreme 15W40, it's full syn, around $20/gallon but they do the Delvac rebate twice a year and you can get back $9/jug on upto 4 jugs each time.
The 15w-40 Delvac Super 1300 is a semi synthetic. It's cold pour point is-33c. I looked up the Mobil 15w-40 Delvac Extreme that is a full synthetic and it's pour point is the same at -33c!! It does have a higher TBN 10.6 to the semi syn's 9.6. Do you think it's worth an extra 6 or 7 dollars a gallon? Also, the I saw a VOA on the Kirkland's diesel sold at Costco and it had a TBN of 10. I don't remember what the cold pour point is but I'll bet it is close to the Delvac Super 1300 15w-40 semi syn. Unless the weather where you live gets below -30c you should not have a big concern about the normal cold temps you get in New Jersey. -30c is -22F in case you are interested. 15w-40 HDEO for the win!!So that kind of fits in the thought process in my thread on 15w-40 vs 5w-40 in my low use car.
15w-40 syn is an option too… though I think if I’m paying for syn I should be paying for the better startup flow of a 5w-40, because even in my trucks, I haul heavy sometimes, but not terribly far or on challenging terrain, so the benefit of a syn 15w-40 in terms of robustness isn’t a major factor.
I thought that Ford standard was mostly Ford's disagreement with the API about minimum ZDDP levels and it's mostly just CK-4 with 1000ppm minimum phos requirement, I think it says more about the Ford PSD design than it does modern oils having lower phos levels, is there any proof that the Benz engine or a Cummins needs higher zinc.supertech diesel. cheapest one and its both ford wss and volvo vds certified. Delo and delvac are just vds certified and fords wss is supposedly pretty strict in wear protection.
Yeah … FF in DMax and CAT in another drum…The 15w-40 Delvac Super 1300 is a semi synthetic. It's cold pour point is-33c. I looked up the Mobil 15w-40 Delvac Extreme that is a full synthetic and it's pour point is the same at -33c!! It does have a higher TBN 10.6 to the semi syn's 9.6. Do you think it's worth an extra 6 or 7 dollars a gallon? Also, the I saw a VOA on the Kirkland's diesel sold at Costco and it had a TBN of 10. I don't remember what the cold pour point is but I'll bet it is close to the Delvac Super 1300 15w-40 semi syn. Unless the weather where you live gets below -30c you should not have a big concern about the normal cold temps you get in New Jersey. -30c is -22F in case you are interested. 15w-40 HDEO for the win!!
By the pour point logic, Kirkland pours to -36C, even colder.The 15w-40 Delvac Super 1300 is a semi synthetic. It's cold pour point is-33c. I looked up the Mobil 15w-40 Delvac Extreme that is a full synthetic and it's pour point is the same at -33c!! It does have a higher TBN 10.6 to the semi syn's 9.6. Do you think it's worth an extra 6 or 7 dollars a gallon? Also, the I saw a VOA on the Kirkland's diesel sold at Costco and it had a TBN of 10. I don't remember what the cold pour point is but I'll bet it is close to the Delvac Super 1300 15w-40 semi syn. Unless the weather where you live gets below -30c you should not have a big concern about the normal cold temps you get in New Jersey. -30c is -22F in case you are interested. 15w-40 HDEO for the win!!
Pretty much all the Rotella HDEO except the multivehicle uses a similar add package and should have around 1100ppm of phos, Delvac Extreme should be near 1200ppm.By the pour point logic, Kirkland pours to -36C, even colder.
Daimler on the other hand doesn’t permit 15w oils anywhere near as low.
The rotella semi syn looks interesting because it has high zddp, some moly and other good adds from the PQIA VOA.
Even if it were true that ford doesn't do diesel oil testing and that it must have 1000ppm zddp it couldn't possibly hurt to have 1000ppm instead of 800 in the same diesel oil anyway. But ford does have actual test. And the article says 1000 hour and talks about phosphorous and not zddp anywhere which is weird. It's astm WK72778.I thought that Ford standard was mostly Ford's disagreement with the API about minimum ZDDP levels and it's mostly just CK-4 with 1000ppm minimum phos requirement, I think it says more about the Ford PSD design than it does modern oils having lower phos levels, is there any proof that the Benz engine or a Cummins needs higher zinc.
and ZDDP is the primary phosphorous containing compound in motor oil, in the case of talking about phos limits, largerly ZDDP levels and phos levels are synonymous.Even if it were true that ford doesn't do diesel oil testing and that it must have 1000ppm zddp it couldn't possibly hurt to have 1000ppm instead of 800 in the same diesel oil anyway. But ford does have actual test. And the article says 1000 hour and talks about phosphorous and not zddp anywhere which is weird. It's astm WK72778.
And this is an old article about it~ https://www.fuelsandlubes.com/ford-6-7l-valve-train-wear-test-to-be-completed-by-the-first-quarter/