Quote:
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.