[Puddin]

Originally Posted by onequicks10

Hello! I have a 2022 ZL1 that I recently put Kooks longtubes, Rotofab cold air intake, and Borla exhaust on. Well this afternoon I had it dynotuned and the first pull went perfect for baseline run, no issues. Then he adjusted air/fuel for the lean codes, and removed the cats from the PCM. Second pull(581hp@6500 RPMS) the front main starting spraying oil at the top of the RPM range. He shut it down, cleaned it all up and the leak is gone at idle. So lthen he asked me what he wanted me to do(I had a hour drive home), and I just said cruise it at 70 for a few miles then punch it to 110 and let it decel, just to see if it leaked at all during driving conditions. Nothing, we looked it over THOROUGHLY, I drove it home and it runs perfect, no leaks no nothing.

Has anyone heard of this?? Any idea what could have happened, what should I do before trying to finish the tune.

Change that front main seal or you'll be changing out a motor. Change it to the Ls seal as the Lt seal is weaker.