Marvel Mystery Oil

[Ldub]

Our engines don't burn oil as much as pump it out through the PCV system due to internal pressure or vacuum (more correctly).

Couldn't agree more...

[kehecross]

If oil consumtion is also being caused by pcv, Then why does it take 50,000 miles for it to show up? I would say it might be a small part of the problem. Or are you saying that because the oil holes are plugged this causes the internal pressures to force the oil out?

[89Vette]

If oil consumtion is also being caused by pcv, Then why does it take 50,000 miles for it to show up? I would say it might be a small part of the problem. Or are you saying that because the oil holes are plugged this causes the internal pressures to force the oil out?

PCV's are basically installed and built-in to compensate for increasing "blow-by" as engine's age. The older they get, the more blow-by...and need for pressure equalization.

IMO, the question is whether issues with ring design is causing pre-mature blow-by....and "engagement" of the PCV function.

[VX KAT]

PCV's are basically installed and built-in to compensate for increasing "blow-by" as engine's age. The older they get, the more blow-by...and need for pressure equalization.

IMO, the question is whether issues with ring design is causing pre-mature blow-by....and "engagement" of the PCV function.

wow, that's interesting, I didn't know how the pcv worked.
What would happen if the pcv valve got stuck closed?

[tom4bren]

wow, that's interesting, I didn't know how the pcv worked.
What would happen if the pcv valve got stuck closed?

On one of the engines I just mentioned, it caused oil to spray out of the dipstick tube. $8 & 5 minutes of labor later & I was back to 2000 miles to the quart.

[tom4bren]

Excessive head pressure isn't just an Isuzu thang. I had 2 MOPAR engines in the past that required constant maintenance of oil breather & PCV. They would crud up worse than a North Dakota nostril in February.

[kehecross]

PCV's are basically installed and built-in to compensate for increasing "blow-by" as engine's age. The older they get, the more blow-by...and need for pressure equalization.

IMO, the question is whether issues with ring design is causing pre-mature blow-by....and "engagement" of the PCV function.

Question answered!!! If the oil rings are getting gunked up and are sticking inside the groove that would aid in the added blow by (although they are just a scrapper and as far as I know they do not add that much to compression.) So as I said in previous post I did change out the PCV and had no change in oil consumtion. The PCV can only do so much. So one must get these rings and holes cleaned up someway short of a complete rebuild.

[blacksambo]

So one must get these rings and holes cleaned up someway short of a complete rebuild.[/QUOTE]

That's why I mentioned Marvel Mystery Oil.

[kehecross]

Yes sir I got ya