Vintage Mobil 1 API SJ

[Keithly]

 

[JAG]

Note the use of significant magnesium detergent along with relatively low calcium detergents, by today's M1 PCMO standards. That's how M1 used to be back then. No moly is interesting. Assuming this old oil isn't degraded, the oxidation at 79 indicates significant use of esters. Now M1 PCMO shows much less esters, judging by virgin oxidation levels. Maybe this oil is a bit degraded though since nitration is 6.

 

[BrianWC]

Vintage? I'm running this oil in my saab right now!

I've got a ton of SJ M1 (Supersyn, TriSyn) and SJ Pennzoil Synth.