Detergent oil

[Y-Blockhead]

Originally Posted by Kevin in NJ

Here is a question..

Who knows of any recent engine that has had issues with dirt causing pre-mature wear and failure?

Who knows of any recent engine that has failed because the oil went bad?

So far I have never heard of any, modern or old normal engines that may have failed because the oil failed or too much dirt caused it to fail. Of course, I want to hear some science to back up the diagnosis, not 'it must have been the oil'.

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??

[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.

[40 Deluxe]

Originally Posted by SeaSlugs

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.

Didn't know there are seals in hydraulic lifters!

[SeaSlugs]

Originally Posted by 40 Deluxe

Didn't know there are seals in hydraulic lifters!

thats what make them hydraulic - tappets or solid lifters are just that. no cushioning effect and thus must adjust valves and worry about zinc levels in modern engines (jeeps 4.0 straight 6 for example)

https://www.youtube.com/watch?v=lorANZ1Tptw

crude but shows how a hyd lifter works - some have seals some are extreme tight machining processes that act as a seal but wear increases the gap with time so as oil heats up it sounds like box o rocks cuz no pressure. but yes they can get stuck (generally from too much wear and parts bind) but from what ive seen and experienced they usually are worn out/leaky.

[Railcarmover]

Originally Posted by 40 Deluxe

Didn't know there are seals in hydraulic lifters!

me neither