Yes on torque convertor lock up mine is MESS UP. It happened after I swap bad computer with junkyard computer so I suspect computer been Programmer because it wasn't feel like stock truck.
It will lock up torque convertor at 39-40 that way EARLY and rpm were 1100-1200.
Before I bought scan Gauge E from here. I calculate/write on paper. Most time it average 15.30-16 CITY with TRAFFIC. Long trip highway/country road 50-55 mph with boost under 0-2 psi only 18 mpg. That how I knew something is WRONG with this one. Hoping it 2 bad injectors affect it. It supposed to get 20-23 mpg from that.
On HPOP oil you really don't need change in my opinion. They flow almost 5 quarts of oil in 1 min at 500 RPM that what I heard.
I running 5w40 Shell T6 SYNTH so I knew it was band aid bad injectors during winter.
My project next week if guy had title to International truck I be pulling 8 injectors and swap 2 bad injectors in F350. Keep spare for later. Replace bad leak turbo and hook booster leak detector to find where leak.
Replace broke leaf spring on driver but had 2 new leaf springs to go on it. I was plan remove 4" block and swap with 2" to get rear end lower 2" down. It sit way HIGH than I like. Hoping it improve mileage by lower truck height.
Here picture of F350.
