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would it be heinous to just mix them together?

Interesting. I was thinking about my LFX engine which is known to have high oil pressure, up to like 90psi, but the PF63 filter it uses has a BPV rated at 22psi. But I see you're point, its not the pressure in the system that counts, its the pressure across the filter.

I have a case of DI40 from my old car. I now run a GM LFX (3.6l V6) in my track car. How would this compare to Mobile 1 Euro 0w40? which I also have a case of. haha. The factory fill for the LFX is 5w30.

I've been doing some research on the filter leak and found that the LFX runs an unusually high oil pressure and there was actually a TSB on oil filter installation saying to tighten to one full turn or 10Nm. I guess they updated the AC Delco filter's labels to reflect this. So maybe I j just...

That's wild. I heard of that happening as well and I think it is what happened. I wish I kept it to inspect later. It reduced the car's maiden track weekend to about 9 laps, but at least I got a time trial in. I see AC Delco has a PF63 and a PF63E which says "Professional" on it. Is the E/Pro...

Hey all, long time lurker here. These LFX engines are getting to be popular for swapping into other cars. I have one swapped into a Mazda RX8 that is built for track days and time trials and its great. Factory oil for this is Dexos 5w30. Would you all recommend changing this at all for track...