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**hatzie** · 10-23-2015, 06:19 PM

I run inexpensive Synthetic Diesel oil specifically Rotella T6 5W40 in everything but the mowers, tiller and, log splitter that call for 10W30. It meets API: SM, SL, SJ, SH and API: CJ-4, CI-4 PLUS, CI-4, CH-4, CG-4, CF-4, CF and JASO-MA so even my Polaris Sportsman 500 uses it.
The Molybdenum, Boron, Zinc and, Phosphate levels are much higher, in some cases almost double, what spark ignition only oils. Anti-wear additives like zinc and phosphorous are very important for flat tappet motors like our GM small block and big block motors.
Mobil 1 Turbo Diesel Truck 5W40 is the other excellent inexpensive oil. Mobil 1 is available in a lot of different formulations. The passenger car variants don't have near the add pack the diesel truck oil has.

With these two oils you won't need extra ZDDP. You can get Mobil 1 Turbo Diesel Truck 5W40 & Rotella T6 5W40 at Wal Mart for around $20 per US gallon. Inexpensive not cheap...

10-23-2015, 06:19 PM	#5
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,020	Re: What engine oils are you guys running?! I run inexpensive Synthetic Diesel oil specifically Rotella T6 5W40 in everything but the mowers, tiller and, log splitter that call for 10W30. It meets API: SM, SL, SJ, SH and API: CJ-4, CI-4 PLUS, CI-4, CH-4, CG-4, CF-4, CF and JASO-MA so even my Polaris Sportsman 500 uses it. The Molybdenum, Boron, Zinc and, Phosphate levels are much higher, in some cases almost double, what spark ignition only oils. Anti-wear additives like zinc and phosphorous are very important for flat tappet motors like our GM small block and big block motors. Mobil 1 Turbo Diesel Truck 5W40 is the other excellent inexpensive oil. Mobil 1 is available in a lot of different formulations. The passenger car variants don't have near the add pack the diesel truck oil has. With these two oils you won't need extra ZDDP. You can get Mobil 1 Turbo Diesel Truck 5W40 & Rotella T6 5W40 at Wal Mart for around $20 per US gallon. Inexpensive not cheap... __________________ 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. Last edited by hatzie; 10-23-2015 at 06:26 PM.