The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - What oil are you using in an older flat tappet motor?

**hatzie** · 01-04-2022, 01:03 PM

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.

01-04-2022, 01:03 PM	#13
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,020	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. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF 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.