Quote:
Originally Posted by mannys9130
I only use Mann. 9 bucks and it comes with a crush washer and o-ring.
Agreed, even with synthetic oil the soot loading is what makes oil "bad" in these engines. That happens 3-5k miles no matter what oil is in it. Dino is good for 3k. If you want a better oil and don't mind spending more, synthetic IS better but it still goes bad at 4 or 5k at the MOST! There is no extending OCIs safely in these motors, sorry.
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Factory oil change interval is 5k on dino oil. Synthetics can go 7,500-8 miles without oil analysis. Soot loading on some oil analysis show soot loading to below 2% at this mileage which means OCI can be extended out.
Here is James Dean's posted 617 UOA with 7.4k miles on Dino.
http://www.peachparts.com/shopforum/tech-help/316346-420sel-300sd-oil-analysis-report-thoughts.html
Some past discussion on extended OCI.
http://www.peachparts.com/shopforum/diesel-discussion/333781-dump-rotella-t6-use-delvac.html