Jerry
The Mobil Delvac 1 does meet the CH-4 rating, but it is nearly impossible to find around here, and the only place I found that stocked it, wanted over $20.00/gal.
That's getting close to $100.00 per
oil/filter change.
I can't justify that when I know of Powerstrokes with over 500K miles running Rotella-T at $6.00/gal.
Several months ago I bought the entire stock of Mobil-1 5-qt. jugs at Wal-Mart. This was before the change to "SuperSyn".
Was this the change to the .1% Phos. content?
I hope not, as I'll go buy them out again to get the current formulation.
Thanks,