So you bought a used high mileage truck, that have tendency for the a misfire on cylinder 8 and you blame the seafoam? Not only that you had this code and drove on it for 4 months and the the engine blew? No offense, but usually if you get a code its warning you of an issue to look into, correct, or stop operating under normal load. On top of all of that the previous owner didn't take care of the vehicle. You can't blame the seafoam on this can you? Sounds like this truck was going to have issues no matter what you did to it.
Truck had zero issues before seafoaming it no check engine lights etc for a year, cleaned the throttle body because the idle was high from the butterfly sticking slightly.
No offense taken but like I said the misfire would come and go to the point it would be gone for a month at a time. I swapped injectors, coil packs, new spark plugs and the misfire didn't follow, compression test and everything checked out fine truck even ran fine? So that's why I ended up ignoring it and assuming it was the lash adjusters bleeding down from sitting.
When my builder tore the motor down and found clogged up oil passages? Kind of narrows it down especially after driving it for year and regular oil changes every 5k with Pennzoil platinum and mopar filters before I decided to seafoam it?
Read around online I'm not the first with seafoam issues. Same goes when you power flushing your trans. Just keep up on normal fluid changes and you'll be fine.... my 2005 6mt G35 coupe had over 170k when I sold it zero issues no oil burning etc kid came from San Fran to Los Angeles and drove it home still no issues with anything. Only thing I ever did maintenance-wise was fluid and filter changes and the only repairs besides fixing stuff from being slammed on coilovers was a thermostat and only reason that failed was the car idling for 2 hours waiting to be staged at wekfest with the ac on in the middle of May. And when I replaced the oil pan after smashing it, it was clean even the oil pickup screen was clean.
I can't blame seafoam fully for it my last dodge same year and motor ate its camshafts alive, I'm just going off what my engine builder told me. He's built multiple motors for us my last dodge, my dads 383 stroker, brothers stroked datsun L28, my 350 small block, my current dodge and when he also says its not the first time seeing clogged up oil passages from people using engine cleaners.... I'll just stay away from it.
Btw I got the mileage wrong motor went at 120k bought the truck with 107k. And I cant say how good the truck was taken care of but it did run fine zero issues passed smog and I bought it from the original owner.
End of the day it is also is a Chrysler product I've had two of these trucks die and my dads jeep jk was a laundry list of problems, starting at 30k when the water pump failed and then when the salsa slinger welds on factory track bar axle mount let go on the freeway at 70mph. The only reliable Chrysler we have ever owned was my dads 70's big block short bed power wagon.
