My oil is good n hot, I only switch to oil after it's 176f (80c).
I was on the highway when I noticed the lack of top end.

lack of "Acceleration" is a bad way for me to describe the symptom,
this is a bit more explanatory...

After a certian point of acceleration, the fuel seems restricted and more pedal does nothing. Even flooring the gas from that point... does nothing, the pedal feels like it used to, but before it would go vrooom.

Before the filter change it would Go Go Go. Now it won't go over 64mph.

I switched back to diesel and even after 15 minutes of just
running diesel it reacts the same. It seems to me I used to have better flow.

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OBK #32
1985 300D Turbo (15 gal Greasecar kit installed)
(258,900+mi.) Thanks- Tachometer Fixed. Middle Vents Fixed. Transmission- 1000% better shifting.
Vac leaks- Fixed, Brakes replaced, Steering Box replaced, .... Information Rules.