Forum Discussion
FishOnOne
Apr 13, 2019Nomad
Grit dog wrote:
^Agree, splitting hairs here.
170k on a smoky diesel with a canned tune and in tact Cat. Still not plugged.
140k on a 6.1 Hemi that's been running mostly Valvoline Blue for about 60k miles. O2s and cats are still ok.
The zinc won't clogg your cat but the microscopic zinc particulates bond to the cat internals which prevents that surface from being active. Obviously this process doesn't happen over night but is accelerated typically with engines that burn oil.
These same zinc particulates can clog a dpf since the zinc metal doesn't burn off during regen. This is the number one reason zinc was reduced with the implementation of API CJ4 oils.
About Travel Trailer Group
44,051 PostsLatest Activity: Oct 02, 2025