Thread: Provent 200 outcome after 150,000km

The amount of buildup varies greatly @Dicko. I first became aware of this in the workshop at the Superpit in Kalgoorlie where I used to work. I was friendly with the mechanics in the LV Workshop (always a good idea) and they showed me a bunch of early 1KD intakes in the first batch of KUN26R Hilux. They did this job on all those vehicles. They were mostly around the same mileage as mine, but 99% of it was low speed running within the pit operations. And a lot of idling hours. So the air mass is moving relatively slowly through the intake system and it just assists the deposition of the oil/soot mixture.

They looked like this:



Not good.

Vehicles that are run on faster longer trips as the majority of their mileage will generally experience a lower rate of deposition. The flipside is lots of town driving. This is the elbow behind the EGR valve from a 500,000km 1KD used as a delivery vehicle:



This evening I cleaned the throttle body, valve housing and elbow. Took me 10 minutes with brake cleaner and a toothbrush. The dry soot comes straight off, most of it you can wipe off with your finger. Easy as. I ran a small wire brush around the top of the manifold opening and vacuumed out the soot. Then I stuck my borescope into the manifold and it really doesn’t look too bad at all, really pleased. Certainly nothing as ghastly as the manifolds that have not had a catch can.

What this has confirmed is the importance of regular oil changes because this soot gathering in old oil is no good. OEM filter and shorter oil change intervals are the go for an eventual high mileage engine.