So I have an 06 ss sc stage 2... I got gas one night and didn't realize the gas station put 87 instead of 93 in it. Drove the car fine on the back roads and it was ok. Drove it to work the next day it was fine. Then on my way home from work the car started running like **** and would start backfiring around 4500 to 5k. So I shut it off. Then when I started it again it ran like crap, sounded like a subaru. Anyways I changed the plugs put 93 with some octane booster in it and it runs fine now. Only problem is now my dipstick blows out under heave acceleration and there's a cel for cylinder 1 misfire... car still runs and idles fine like all cylinders work. Can anyone help me out? I'm just hoping it's not something too serious. It has 110k on it. Ran mobile 1 synthetic for high mileage.
If it also help I was running 5w20 and after my ds blew out I put a quart of 5w30 in it to even it out. Idk if that's bad or not on engines

 

Comp test is in order.
Driving the car hard on 87 can cause high Kr.

 

I only put 10 dollars in it. But I'm going to do a compression test tonight. What should the numbers be?

 

The car runs perfectly fine just like when I bought it. Any tall tell signs I should look for?

 

Did you clear the codes after the bad gas incident? You put more oil in AFTER the dipstick blew out correct? Did you verify oil level is correct, not overfilled? Just getting the obvious out of the way.

Is the PVC functioning properly? That would be my first thought if the dipstick gets blown out. But that would probably be a lot of pressure to do that, which may mean piston ring blow by, which is where the compression test comes in.