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^^^ I think the Shell website mentions they make the Penn? But I know never use a Fram oil filter or my engine will quickly blow up!!

I said I would contact the tech guy at Shell the maker of Rotella, and ask about MY case of using conventional Rotella T4 15-40. I told him I am not a RACER, I use premium pump gas, no alcohol, I just don't want to not damage my engine. He said that is their product he recommends. So it...

And.....most all my old cars engines are already woreout!!! :poke: :BangHead: :thumbsup: :steering:

Some say the diesel oil has more detergents that will offset the advantage of the zinc. I think I will try to call a tech guy at Rotella tomorrow!!!! and ask that question!!

Of the puter chart for high zinc content motor oil conventional Rotella 5w-40 is ranked pretty high. Not near as expensive as the high zinc race oils, but I am NO racer.

Bur...O Reilly's computer says it does not fit my car!!!!!!! :thumbsup: :BangHead: :BangHead: :poke:

Dunno!!!I have mu old '95 12 valve. The "kid" has a new Cummins Nisan ( ypung people buy such!) and it has some "stuff" that mixes with the diesel. It goes in another tank' Don't ever forget which tank is which!!!!! :rofl: :BangHead: :BangHead: :BangHead: Smart people have to slow down...

Someone somewhere other said, oils for diesels contain a lot of detergents which reduce the effectivenes of the zinc. Any truth to this. I have used Rotella 15-40 for years but I never drove them THAT much. 60 mi a day to work till that one met a new owner. Back before I retired!

Heads? Did you buy it from RoadKill's Freiberger!?? :poke:

NOTE! I have a complete '64 383 out of a Sport Fury, that is the hp motor for that era. Intake to pan, with oem exh man and like new Hughes am/lifters. S E Tx. $600

Like she said " Boy, you are off ONE notch!"

From 2011!!! OK so some of us are SLOW!!! Like said, keep the GM power in GM cars, etc. Any slant that ha been rebuilt and runs lke crap has a PROBLEM with its guy that did the work.

Unless your dad own's the local bank, the bottom line question is which engine gives you the usable (streetable ,, for me) power for the least cost. Interesting discussion.