Mobil 1 High Mileage

[Polo-1]

Whatever oil you pick, you need to find 1000 ppm zinc at the minimum for your flat tappets.

http://www.mobiloil.com/USA-English/...duct_Guide.pdf

[Funracer]

Originally Posted by Polo-1

Whatever oil you pick, you need to find 1000 ppm zinc at the minimum for your flat tappets.

http://www.mobiloil.com/USA-English/...duct_Guide.pdf

Cool chart! The Mobil 1 HM 10w40 has 1100, so I
should be good to go.

Thanks

[Hib Halverson]

Originally Posted by Paul Workman

(snip) Marc recommends AMO 10w-40 (with the levels of ZDDP present in the oils originally used in the LT5 at the time of its introduction, by the way).

Just sayin...

P.

What was the phosphorus or zinc level in engine oil which was factory fill in 1990?

[Polo-1]

same as 15-50 1200p/1300z

[gtabert]

Originally Posted by Polo-1

Whatever oil you pick, you need to find 1000 ppm zinc at the minimum for your flat tappets.

http://www.mobiloil.com/USA-English/...duct_Guide.pdf

Thanks for the chart, very helpful.

[Hib Halverson]

Originally Posted by Polo-1

same as 15-50 1200p/1300z

Sorry but that's not correct.

Mobil 1 was not specified for any LT5 until 1993

In 1990, the factory fill engine oil in LT5s was a petroleum-based 10W30 from an unknown refiner which met API Service SG. In the late-80s/early-90s SG oils ran about 800 ppm phosphorous.

Service SG had no minimum requirement or maximum limit for phosphorous or zinc.

Neither ILSAC nor API had any limitations on phos. or zinc until 1992. ILSAC GF-1 and API SH were both debuted in 1992. They had no minimum spec for phosphorous but had a max of 1200 ppm. Virtually all mass-marketed engine oils remained between 800-1000 ppm phos with the majority of them at 800.

[Polo-1]

funny my 1992 Polo Green has the factory Mobil 1 label on the hood. I do not think my 91 or 90 had the M1 label on the hood. Not doubting you, but might want to recheck that

From my memory old SG and SH were testing in the 1200-1600 range. I would have to pull out old Blackstone papers, somewhere...Yes, no min or max. back then who cared, you had enough to not worry about it.

SG - SG/CD - SG/CC - SG/SF/CC all approved for LT5

[Hib Halverson]

Originally Posted by Polo-1

funny my 1992 Polo Green has the factory Mobil 1 label on the hood. I do not think my 91 or 90 had the M1 label on the hood. Not doubting you, but might want to recheck that

From my memory old SG and SH were testing in the 1200-1600 range. I would have to pull out old Blackstone papers, somewhere...Yes, no min or max. back then who cared, you had enough to not worry about it.

SG - SG/CD - SG/CC - SG/SF/CC all approved for LT5

All the hoods had the nameplate because the 92 LT1 was the first factory fill for M1 5W30. 92 LT5s still used petro-based 10W30. Who knows...maybe that was a requirement of GM's marketing agreement with Mobil Oil Corp.

LT5 didn't get M1 5W30 until 1993.

SG no limit
Starting in '92, SH (API) and GF1 (ILSAC) were limited to 1200 ppm phos. max but most of them were down around 800-1000 ppm phos.

[Polo-1]

ok whatever.

We can agree that 1990-95 LT5's have flat tappets and the spring pressure is the same for all years. It should be kept NO LOWER then 1000ppm zinc. If you have a push rod motor with even higher pressure springs, ( lobe to lifter contact ) it should have 1300ppm zinc and phos follows with 100 to 200 lower count. This is basic motor building guide lines. I'm no rocket scientist but I know some

You can go to any cam makers site and look up what they recommend. I would believe they would know best. You will come back with my same #'s.

[dredgeguy]

For the Maryland area, go with Mobile 1 high mileage 10W-30 or 10W-40?