I've been wrestling with switching from the Rotella T to the Mobil 1 15w40 myself. I really could care less about ZDDP levels as I'm running a hydraulic roller. I just want the best lubricity possible. What has me holding back is the reported smaller molecular size of the
synthetic oils. They tend to have the propensity to leak a little more. I've read it but quite frankly knowingly have never experienced it. It still gives me concern. I don't want to give my leak prone FE a reason to leak any more.
It's not just Rick that's the fanatic ... I run an Accusump accumulator system too. It's a 2 quart and it's mounted on the passenger side firewall. It is setup solely for cold-start duty as I don't track my Cobra. It's really great having 30 lbs of
oil pressure coursing through the FE's veins before the ol' crank starts 'a spinnin'.
Pat, you're still spinning a dry crank against a dry journal till the system builds
oil pressure. Suspended solids tend to stay behind when the
oil goes away from the journal, too abrasive for me..