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down_home's avatar
down_home
Explorer II
Mar 22, 2019

Let's Talk Oils

Cat C 7 pre cat 05 spec for uls or high suflur diesel for that mttr.

I have been using Delo 400 because of high zinc content and cam and pump etc.
I spoke with one tech who is using Delo synthetic and Rotella synthetic in his older Cats.
He says diesels will use or burn some Delo between changes
I had read everything I could find about hich oil to use before sticking with Delo.
Anyone running synthetic oil in their older pre ULSD cat engines?
Anyone reporting problems with cam etc using synthetic without zinc of course?

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  • MEXICOWANDERER's avatar
    MEXICOWANDERER
    Explorer
    Mar 22, 2019
    IMHO

    Delo 400 and Shell's Rotella T, are damned hard to beat. My N series 855 Cummins thrives on Delo 400 15W-40

    Some people try and cure problems bass-ackwards. Because where I drove Quicksilver temperatures could hit 122F. I had a 5 row radiator built. The engine coolant temp goes to 185F max even climbing hills. My concern was to keep turbocharger oil temps within reason. So I have a 5 minute engine after-run. No way in hell am I paying premium money for a 55 quart oil change. Changing the element in the C-750L Luberfiner filters soot. So someone tell me -why- synthetic would be a bonus? Is it to try and cobble design shortcomings?

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