Any known factors affecting oil consumption?

[rowhard]

I know I also use oil, but damn if I can figure out why, or what induces it. I do notice, sometimes on start-up I get a puff of blue smoke, but not always. I just except that it uses it and I just keep a eye on it.

[psychos2]

PCV valve was one of my issues. i have discussed in previous posts. shawn

[Knigh7s]

I seem to remember one member here (maybe AlaskaVX?) saying that he and his mechanic found a small leak from the back of one of his valve cover gaskets that was his oil loss culprit. Hardly noticeable even when they knew it was there, but something like that may account for the burning smell you notice at start-up...ie; oil leaks past the valve cover gasket after shutdown, then onto the exhaust manifold, and as the exhaust mainfold heats up at start-up, the oil that has leaked onto it is burned off. But since the burning oil smell is just carried off with the airflow over the engine during driving conditions, even though there still may be oil leaking onto your exhaust manifold, you wouldn't be able to smell it as easily.

Not saying that's it, but the symptoms seem to fit anyway.

Thanks for that info, I'm for sure checking that out this weekend.

PCV valve was one of my issues. i have discussed in previous posts. shawn

I've done the PCV change religiously, but seem to have the problem still. I have noticed that I had oil blowby from the grommet (about 1 week after installing a new one), but very very little. I think it is because the PCV I'm using is to thin at the bottom. I will be buying a new grommet soon and see if that helps that situation any...

[tomdietrying]

Hmmm, before this Moab trip I switched to Firestone's more expensive synthetic oil. I did notice I would use about a half quart of oil every 1,000 miles on this trip. I seemed to burn more driving 80+ mph on the highway to and from Moab.
Peace.
Tom

[Gussie2000]

I recall reading this articule about isuzu's 3.5L engine oil burns was related to the cylinder's size,they say isuzu engineers looking into reducing the 3.5L engine's weight they mistakenly designed the cylinders lenght size too short to handle the engine displacement & along with wrong cylinder rings specs.

I'm not sure how much this can be true,but to me it makes sense somehow

[johnnyapollo]

I've calculated that I lose about 1/4 qt every 1k miles. My VX has done this since I bought her new and it's been very consistent. I've been told it's typical with this particular motor and I believe it.

-- John

[VX KAT]

Like you Tom I kind of thought it must be due to the long stretch of high speed driving, so I fully expected it to do the same thing on the way home...but nada, not a drop appeared to be missing. Then I thought maybe due to some changes in elevation but, the 4,000 - 6,000 feet were almost identical to my daily/home location. I think it must be something with the high speed driving, but the real mystery is why the heck it didn't happen on the way home?? .....

oh well, who knows, just another one of the wonderful mysteries of the VX! :grinp: