Opinions? Rotella T Syn 5w-40

[AH64ID]

Yes that is a flat tappet, or at least what I understand to be a flat tappet.

AFIK all years, to include the 6.7, are flat tappet with a similar style.

12V trucks had a 1.1" tappet
24V trucks had a 1.3" tappet
HPCR trucks have a 1.5" tappet.

All trucks use the same length pushrod, and the 24V is the most desirable based on size and weight. I used them in my rebuild.

Looking up at my post with the photo I thought I had written something, but it's not there. That is a tappet from my HPCR motor.

 

[Tractorat]

Thanks,
Then that reopens the question, should zddp be added to delo ? And does a good synthetic need to have zddp added ?

 

[spin05]

I just bought my truck and changed the oil with NAPA premuim 15-40 which is suppose to be valvoline premuim blue . That said i race motocross and have ran Rotella T Syn 5w-40 in our race bikes since 07. The engines still look like new when we do rebuilds. Am thinking my next oil change going with rotella for the truck.