Detergent oil

[SeaSlugs]

Originally Posted by Y-Blockhead

Don't know but I have seen (and heard) many more modern cars running like crap because of stuck hydraulic lifters... could it have been caused by dirt and varnish??

Were they stuck or collapsed? I'm thinking the later. GM lifters love to leak down in the night so they need to be pumped back up the first few miles of running in the morning. Sounds like a box of rocks in a garbage disposal chatter. Fords from my experience are the other way and collapse once the oil thins out. Both problems caused by seals that are worn out.