Oil burning but nothing on plugs

[Chris142]

The trooper we bought last February uses oil. Common problem with these as the drain back holes behind the oil rings are too small. They get plugged up and the oil can't drain through them so it gets burned in the cylinders.

It's usage seems to have settled @ about 250 miles per qt of 10w30.

I'm doing a B12 soak tonight so I pulled all 6 plugs.

I was expecting to see ash deposits on the plugs or at least some sort of deposits on the worst offending cylinder.

The NGK double platinum plugs I pulled out of it look brand new! No sign of oil on any of them. According to the records they have been in the engine about 18000 miles.


Long enough to have fouled me thinks.

Anyway in the morning I will drain the oil,put the plugs back in and put Valvoline restore and protect 5w30 in it to hopefully help clean things up.

 

[altaylar]

It is burning 1 quart of oil every 250 miles, so that is about 20 quart of oil if you change every 5k miles? That is high even for that engine.

There are a couple reasons why it might be that you did not see what one would expect. First one comes to mind is most modern synthetics burn much cleaner with lower residue than older ones. Also those platinium plugs stay really hot through the usage, likely burning of everything asap. Though sometimes oil ash leaves bone white colour residue behind (unlike fuel`s dark residue). Also if the oil atomizes rather than leaking past, it can cause a clean burn

 

[Chris142]

First one comes to mind is most modern synthetics burn much cleaner with lower residue than older ones.

That's not it unless traveler and SuperTech oils are synthetic. I have not put expensive oil in it yet. That will change tomorrow with the restore and protect.

 

[OM617YOTA]

Oof, no point doing oil changes with that kind of consumption, just replace the filter every so often.

Hope the piston soak and Valvoline Restore and Protect can work their magic and solve that, best of luck.

 

[altaylar]

Oof, no point doing oil changes with that kind of consumption, just replace the filter every so often.

Hope the piston soak and Valvoline Restore and Protect can work their magic and solve that, best of luck.

that vehicle takes 4-6 quarts of oil. Literally all the oil would be replaced in 1-1.5k miles. I would also not use expensive oil if this was mine.

I am hopeful that Valvoline Restore and Protect will alliviate the situation, at least to a degree

 

[Chris142]

Oof, no point doing oil changes with that kind of consumption, just replace the filter every so often.

Hope the piston soak and Valvoline Restore and Protect can work their magic and solve that, best of luck.

What's odd is that he thing sounds great and runs well. Even passed the California emissions test where they put the car on rollers and run it,

 

[altaylar]

What's odd is that he thing sounds great and runs well. Even passed the California emissions test where they put the car on rollers and run it,

If this was not your thread, or the vehicle in question was something else, I would start suspecting an oil leak rather than oil burn.

 

[Chris142]

If this was not your thread, or the vehicle in question was something else, I would start suspecting an oil leak rather than oil burn.

Doesn't leave any drips. She can drive around town with no real issues. One good run up cajon pass and it will burn a qt.

 

[SubieRubyRoo]

PCV circuit?

 

[Chris142]

PCV circuit?

New OEM valve about 6 months ago. Thing has annihilated my oil stash.

 

[SubieRubyRoo]

New OEM valve about 6 months ago. Thing has annihilated my oil stash.

Have you checked out the hoses and make sure it’s actually sucking the vapors under vacuum?

 

[Chris142]

Have you checked out the hoses and make sure it’s actually sucking the vapors under vacuum?

Ya. I replaced the hose that leads to it and it does have strong vacuum. Well it did a few months ago..I'll double check it tomorrow when I put the plugs back in.

 

[fantastic]

Use some 20w-50 until it locks? No stains, then yeah, it's burning it. Sounds like it's beyond repair but let us know how the R&P goes.

 

[02SE]

Make sure the EGR valve and flow port isn't plugged up.

 

[Chris142]

Make sure the EGR valve and flow port isn't plugged up.

Had to fix that to pass emissions test,

 

[Chris142]

Use some 20w-50 until it locks? No stains, then yeah, it's burning it. Sounds like it's beyond repair but let us know how the R&P goes.

The book allows 20w50. Don't need it to lock up as she needs it for school.

 

[skaughtz]

The trooper we bought last February uses oil. Common problem with these as the drain back holes behind the oil rings are too small. They get plugged up and the oil can't drain through them so it gets burned in the cylinders.

It's usage seems to have settled @ about 250 miles per qt of 10w30.

I'm doing a B12 soak tonight so I pulled all 6 plugs.

I was expecting to see ash deposits on the plugs or at least some sort of deposits on the worst offending cylinder.

The NGK double platinum plugs I pulled out of it look brand new! No sign of oil on any of them. According to the records they have been in the engine about 18000 miles.


Long enough to have fouled me thinks.

Anyway in the morning I will drain the oil,put the plugs back in and put Valvoline restore and protect 5w30 in it to hopefully help clean things up.

I would suggest doing the soak over multiple days if the consumption is that bad. B12 is pretty cheap (or at least it was). My Camry was burning a quart every 350 miles. A five day, five can soak took her down to a quart every 3000 miles. B12 in each cylinder, half a dozen manual rotations, soak for 8 hours, repeat.

 

[Chris142]

I would suggest doing the soak over multiple days if the consumption is that bad. B12 is pretty cheap (or at least it was). My Camry was burning a quart every 350 miles. A five day, five can soak took her down to a quart every 3000 miles. B12 in each cylinder, half a dozen manual rotations, soak for 8 hours, repeat.

I wish I had that much time. Been wanting to do this soak and this weekend was the first chance I got. She needs it for school Monday and in case of an emergency she needs the car drivable.

 

[facility1]

just a dumb question, are you sure its burning oil and not leaking out somewhere? or blowing out when driving. How does your exhaust pipe at the end look, clean or sooty, & wet, are engine temps up to a decent level, injectors clean?, clean air filter? PVC valve?

 

[billt460]

Doesn't leave any drips. She can drive around town with no real issues. One good run up cajon pass and it will burn a qt.

That thing has to be smoking more than the Blue Angels in the Diamond Formation!