Isuzu bulletin confirms oil use bull****

[pbkid]

BTW, I've never hated Isuzu at any time. I love my VX and my engine.
x2

If I was one of those who lost an engine after losing a damaging amount of oil in just 2000-3000 miles, then I'd be boiling mad.
ya, it does kinda suck....

Mark

I think IF my VX ever dies a full 'yota drivetrain might just slip in there nicely. And no worry about finding parts!

that was always my plan for my VX ultimately. especially because you could easily get SAS parts for toyota stuff....

[Marlin]

that was always my plan for my VX ultimately. especially because you could easily get SAS parts for toyota stuff....

You might be able to throw some nice FJ cruiser parts in there............................................. ................... That was for Zeus

[DarkWing]

I wish my V only drank 1qt. in 1K mi. I check every fill up, about 270 - 300 Miles, and I have to add each time. I'll empty a 5qt. container of 5W30 Full Synthetic every 3000 miles.

[TheGanzman]

I always feel sheepish when I mention that my 61K mile 2001 VX uses ZERO oil between 5K (synthetic) oil changes - kinda makes me feel "guilty" that I'm not having this problem!

Big Swede, I hope you don't mind me quoting your post from another oil consumption-related thread:

"Sometime in 2000 IIRC Isuzu changed the piston oil ring design to include additional drain holes. This was the primary culprit, although clogged EGRs seem to be a contributing problem too, near as I can determine.

The updated design can be identified by a screw-in PCV valve, as opposed to a push-in design earlier..."

This got me curious, so I went out and checked mine. Unless it was changed, mine is (still) a push-in PCV valve (it's an Isuzu P/N/# too), for the record...

[lasturbo]

So after reviewing this whole thread again, there is nothing you can do to stop the consumption (additives etc.) and just keep it "topped up" at the interval your VX consumes? What is the cause? Oil passages, rings? There was mention of a ring change in MY(Model Year) 2000 which may explain the later models not using as much as MY 1999. Also, if the EGR was clogged, I would think that would throw a check engine light fault as well. Deermagnet, Darkwing and Nfpgasmask-What is your consumption? Mine is 1 quart in 500 miles using Castrol Synthetic 5w-30. I am sure the thinner oil does not help and I do not abuse the vehicle. I change the PCV every 1000 miles and change the oil every 5000 miles. The tailpipe does have some soot on it but I figured with 142k, just keep topping it up and it should keep running!!

[nfpgasmask]

Nfpgasmask-What is your consumption? Mine is 1 quart in 500 miles using Castrol Synthetic 5w-30.

Yeah, sounds about right. I burn a quart every 500-1000 miles as well, depending on what kind of driving I do. 5W, 10W, 15W, change the PCV every oil change, nothing stops it for me...

Bart

[BigSwede]

So after reviewing this whole thread again, there is nothing you can do to stop the consumption (additives etc.) and just keep it "topped up" at the interval your VX consumes? What is the cause? Oil passages, rings? There was mention of a ring change in MY(Model Year) 2000 which may explain the later models not using as much as MY 1999.

According to Jerry Lemond and the chart above, the improved ring design actually came in mid 2001, not 2000 as I said earlier from memory...

[SlowPro48]

Lasturbo, I don't think any of us Average Joes know FOR SURE what causes the oil burning. If I'm reading the chart that Mark posted properly, the Trooper got the 3.5 liter Reference Code "B" engine in mid-2001 but the VX never got the "B" engine with the updated pistons/rings - or whatever the mods were. So the wide variations in oil burning we see on this forum aren't due to design.

Bottom line is too much oil is getting past either the rings or the valve seals (maybe both!) or getting sucked in with the intake charge (.i.e. through PCV) those are the only ways for oil to enter the combustion chamber. Don't blame the nasty EGR - it's role is after the combustion process - so EGR woes are a result of oil burning not the cause.

Somebody correct this if I'm wrong but from what I can gather, the most popular explanation is lack of oil-drainback holes in the piston. If that's the case anything you can do to keep those holes clear and to keep the oil rings clean and free will help the situation. You might want to try using Rotella T 15W-40 oil which is made for diesels so it's high in detergents. And just in case there's something to the PCV theory (which has always confused me because it seems if you have a clogged PCV valve there would be less crankcase vapor/oil consumed, not more) you should make sure your PCV valve rattles every time you change the oil.