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Old 06-24-2020, 07:10 PM   #11 (permalink)
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Originally Posted by California98Civic View Post
I wonder if there would be any use in throwing in a can pre-emptively? In other words, is it the kind of issue where catching it earlier can prevent the problem from becoming significant? Could pre-emptive use somehow protect the rings from wear?
Regular oil changes (at least every 5K miles) with high quality synthetic oil will be more helpful if you aren't already doing so, but adding Restore may help fill in whatever wear it has and I don't see how it could do any harm.

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Old 06-25-2020, 12:02 PM   #12 (permalink)
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What's the most mileage an engine could reasonably go before it starts consuming oil? I only change oil once a year(8-9000 miles) & see no loss of oil. The car is 15 years old with 160,000 miles. Just use standard Mobile 1 synthetic oil.
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Old 06-26-2020, 09:03 AM   #13 (permalink)
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What's the most mileage an engine could reasonably go before it starts consuming oil? I only change oil once a year(8-9000 miles) & see no loss of oil. The car is 15 years old with 160,000 miles. Just use standard Mobile 1 synthetic oil.
Well, technically, from initial start up it should be consuming or leaking. If it gets discolored you are exchanging consumption for contamination.
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Old 06-26-2020, 09:13 AM   #14 (permalink)
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My cobalt will hit 300,000 miles in a few months, some oil changes have been 12,000 to 15,000 miles(following car's oil life monitor). I use cheapest Fram filters I can get and what ever 5w-30 mostly synthetic on sale. It had 26,000 miles when I bought it.

The Elantra seems to use some between changes, and the Impala likes to mark it's parking spot. 11 Rogue uses some (185,000 miles), 15 doesn't. Cruze is unknow yet.

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Old 06-26-2020, 10:25 AM   #15 (permalink)
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What's the most mileage an engine could reasonably go before it starts consuming oil?
I drove an '88 Ford Escort for about 20 years. As best as I remember it starting using some oil at between 250 and 300K miles. I've got an '02 Escort now with 200K miles that uses about 1/2 quart between 5K mile changes. Different engines are different and oil consumption is kind of unpredictable. The first car I ever bought was a 1977 Buick Regal bought new in 1977 it used some oil from day 1. My '16 Versa has about 6500 miles on the oil that's in it now and is still sitting right on the full mark. The Citgo conventional 10w40 is kind of a molasses color not black at all. Unless I see a drastic change in the oil color or the feel of the oil I plan to run it 7.5K before draining it and refilling. I know when my dad bought a new Mercury in '68 the recommended change interval on it was 6K miles. The Buick I bought in '77 had a recommended interval of 7.5K. These were both carburetor V8 engines and before the days of synthetic oil on store shelves. I've never understood why the intervals have dropped over the years with the improvements in engines and oils. I think the Versa should be good for 7.5K and will probably have good life left in the oil when I drain it. Back in the early '90's I had a Chrysler that I used as my work car, it would burn/leak a quart about every 3-400 miles by the time it had 200K miles. At 200K miles I quit changing the oil and used oil that I'd drained out of my better cars at oil change for topping off oil. When I sold the car it had 231K miles and oil consumption was still about a quart every 3-400 miles. I had a friend who needed a cheap car so I sold the Chrysler to him for $250 dollars. He drove it for probably at least a year or two and several more thousand miles before scrapping it because they'd started requiring emissions testing in the area where we lived. The Chrysler wouldn't pass because the catalytic converter had been removed many years before.
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Old 06-26-2020, 12:44 PM   #16 (permalink)
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Quote:
Originally Posted by Piotrsko View Post
... If it gets discolored you are exchanging consumption for contamination.
In other words, piston ring blowby into oil in the crankcase instead of valve stem seal leakage of oil into the combustion chamber when the car is off, yes? I guess a leaking head gasket could also allow high pressure combustion gasses into the oil passages, too. But the oil would not likely be high pressure enough to cross through the head gasket into the combustion chamber, would it?
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Old 06-29-2020, 10:06 AM   #17 (permalink)
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Quote:
Originally Posted by California98Civic View Post
In other words, piston ring blowby into oil in the crankcase instead of valve stem seal leakage of oil into the combustion chamber when the car is off, yes? I guess a leaking head gasket could also allow high pressure combustion gasses into the oil passages, too. But the oil would not likely be high pressure enough to cross through the head gasket into the combustion chamber, would it?
So: I am waaay too dyslexic to be on this forum..... the actual intent was to indicate that zero consumption is a myth, the oil is being added to by the things you indicate above. Quick test would be an analysis.

The valve system leaks both ways, oil to cylinder, combustion products back. Unless you are running sealing style rings, there is a huge leak down at the gap, particularly when the gaps align. I have not experienced a sloppy head gasket, never owned an aluminum block motor except for VW.
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Old 06-30-2020, 09:26 AM   #18 (permalink)
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I will add just for a laugh the civic consumed a quart of oil every 250 miles. Still ran okay and averaged 42 mpg. I just got to the point where i would dump whatever oil in at every gas stop and changed the oil filter when the interval said.
It was basically a two stroke mix car with a total loss oil system in 2000s. Lol
She held steady with whatever power she had left to set me up financially to be where an I today. Rip to that little car.

Yeah so back to the Prius. I think I'm gonna pull the intervals down to 7500 and throw a can of restore in next oil change. I'll compare my last couple oil changes as I think I still have all the used oil bottles still laying around lol
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Old 06-30-2020, 10:03 AM   #19 (permalink)
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Much of the oil consumption issues with the 3rd gen prius has been traced to the egr. Its an easy fix. Take it out, clean it and put it back in. They get clogged and cause oil burning. While in there add an oil catch can. I do the egr cleaning every 50k on mine. Costs me a can of oven cleaner and two hours. 160k and zero oil loss between oil changes.
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Old 06-30-2020, 10:54 AM   #20 (permalink)
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Originally Posted by Yippeekyaa View Post
Much of the oil consumption issues with the 3rd gen prius has been traced to the egr. Its an easy fix. Take it out, clean it and put it back in. They get clogged and cause oil burning. While in there add an oil catch can. I do the egr cleaning every 50k on mine. Costs me a can of oven cleaner and two hours. 160k and zero oil loss between oil changes.
How exactly does a clogged EGR valve cause oil consumption? All the EGR does is recirculate exhaust back into the intake manifold to reduce nox emissions and pumping losses. Or do you mean the PCV valve? That certainly can cause oil consumption if it goes bad

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