Motorcraft for now but gonna try my hand at some valvoline premium blue very soon

I run rotella 15-40 in the cummins, my papaw runs it in everything. Including his gassers. Some mechanic 30 years ago told him " if it's good enough for a diesel, it's good enough for a gas engine" I have been unable to convince him otherwise.

I put sum castrol gtx 5w30 in my truck today

That's what i use in the gassers.

[QUOTE=Roush PSD Interceptor;2358]Rotella 15w40 + 2 quarts Lucas Synthetic Stabilizer, Motocraft FL 1995 and one 12oz bottle of Prolong in the HPOP.
I ran full synthetic last change and will switch back this change.
I always gauge the condition of the dipstick as an indicator of the deposits left behind by inferior oils.
If I can't see the cross hatches on the dipstick thru the oil then it is dirty enough for a change.

My uncle is the shop steward/foreman for Cummins Crosspoint LLC, Cross Lanes, WV.
For 40 years he has worked there.

He says they used Valvoline with the ultraviolet dye marker for break-in oil on the larger engines like the QSK70
at that rebuild shop.
IDK maybe they switched to Delo 400 since he told me that.

We're talking apples and oranges there... the QSK 70 is a full blown industrial engine. I can see the use of oil dye in those. The ISB was initially a light industrial/ equipment engine that was adapted to the automotive platform.

Rotella all the was I run it in the cummins the four wheelin truck and all our tractors an combines I'm a very firm believer in it

5qts plus a fram filter special at AZ $19.99 , but i had to buy a extra quart and a motorcraft filter , so i got a fram that will fit the ol ladys car

We use fram filters for the gassers, not sure what i put on the cummins. I've only changed it once, and forgot what i bought. it's white though.

fram filters suck on fords , makes them knock when u first crank them

FRAM :suicide:

They had a similar deal on fram out here. I put one on once and it kept working loose and dripped. Not talking like pouring, just enough to drip.