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Old 01-04-2022, 01:03 PM   #13
hatzie
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Join Date: Oct 2008
Location: Wentworth, NH
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Re: What oil are you using in an older flat tappet motor?

Any of the diesel oils with higher Zinc and Phosphorous content like Rotella T5 & T6, Mobile 1 TurboDiesel Truck, Chevron Delo, Mobil Delvac, and several others.
I run the higher zinc/phosphorus witches brews in my Aircooled engines.

Here's a ZDDP oil list.
https://www.autorestomod.com/oil-zddp-list.html
I would look up some recent virgin oil analysis sheets on BobIsTheOilGuy if you're really worried. Over 1200ppm are good numbers but over 1100 is pretty good. A lot of gasoline engine oils average 600-800ppm.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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