Well I’ll be dipped!!

 

ATF is also thinner than motor oil. So it does flow better. Like those links say it's not designed to use in engines.
It does help to fight sludge though. It flows better and faster to break up sludge. But I definitely wouldnt run an engine full time with ATF mixed in. Just my opinion

 

I haven't got the valve covers off yet but on the way home I noticed a pattern. The truck would barely run over 40mph and 2,000 rpm. After some in town driving. But about 5 min of straight 40mph highway driving I was able to slowly creep up to 60mph and it ran perfect the rest of the way home. I plugged this in and noticed this on my 02 sensors. I did some more slow stop and go driving around home and it started running bad again. Misfires and wouldn't go over 40 again. Go on the highway and after about 5 lin it ran oerfe t again. When it would run good the 02 sensor data from bank 2 matched bank 1. Seems odd that I'm getting bank 2 timing errors but bank 1 02 data looks so wrong

 

Heree the other set of 02 data

 

Sludge happens from oil contamination. Usually from blow-by vapors.
A poorly functioning crankcase ventilation (PCV) system can cause sludge.
So can driving short distances where the engine never fully warms up and those vapors condense and drip down into the oil pan or up under the valve covers.

 

Correct me if im wrong but that doesnt look bad for an engine with 156k miles. except for the timing chain that is loose. what do you guys think??

 

Looks fantastic.. Wonder if they really changed that chain or just put a new slider in to take up some slack.

I wouldn't put any additive in a modern oil. That is from when oil science was non-existent. Especially Seafoam. Maybe a lawn mower..

 

very clean. i'm actually impressed. timing chain does look like its got a little slack in it

 

my vvts dont look bad. clean them up or replace them? i going to replace the water pump and thermostat while im in there. there is some carbon buildup on the valves. any suggestions on how to clean them up safely?

 

So the tsb that i have seen shows to replace the vct units. Does that mean the sprockets and the vvt actuators or just the vvt actuators? the sprockets are $100 each. it looks like the dealer only replaced the primary chain as that is what the original tsb instructs. The slack I have is on the secondary chain. I want to do this right so it doesnt have to be done again, but i also dont want to spend $400 extra bucks if its not needed.