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2003 polaris preditor 500 engine smokes and burns oil. compression is 135 and engine still runs strong. What do you think is the problem

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If you still have good compression, and motor runs strong, then the problem is in the head, eg, usually valve stem seals, letting oil in the cylinder. Have your head reconditioned, valve grind, and some new valve stem seals should solve the problem. It is fine to keep riding it, just keep your eye on the oil level, as it will be burning oil.

Posted on Aug 31, 2010


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Hello, I have a 2003 Volkswagon Beetle (gas) and it burns a lot of oil; however there are no leaks and no white smoke.. It runs well..... Can you tell me why? Sincerely, Conrad Smith

Do a compression test to find the reason. Worn rings, worn valve guides, or bad valve stem seals are most likely cause.
A compression test tells you a lot about the internal condition. Cylinders should be closely balanced. Low compression in one or any cylinders should be tested further to indicate where power is lost. Then you do a wet compression test: put about a tablespoon of oil in the cylinder and check compression again. The oil will temporarily seal the rings from losing compression. If the low compression improves noticeably, it tells you the piston rings are worn too bad. If compression doesn't improve, it is a valve problem-worn valve guides, or valve stem seals.
One remedy you could try, since it runs well and doesn't smoke, is to change brands to a better quality oil, and a higher viscosity, like if you are using 5W30, move up to 10W40, or 15W40. The oil sold as for higher mileage engines will have additives to try and help with oil consumption. It often helps, not always.
You probably won't see the tell-tale bluish smoke from the exhaust indicating oil burning, until oil consumption is very high-like about 1 quart every 300 -500 miles. A quart every 1,000 miles is a concern, but many manufacturers will call that "normal", especially if still under warranty, pretty shady, but that's the facts.

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1990 toyota corolla le just started with gray smoke coming out from exhaust

I think that could be your valves, or piston rings. when they get old and worn, oil can get past them, and then the oil burns (along with the fuel), making the smoke coming out of your exhaust. I'v has some car which smoked VERY badly, and I tried a additive called "restore" (that have it walmart, and other auto stores for about $6-$7 in a silver can). After about 400-500, it really helped. But I think it will only help if the problem is your piston rings (and not your valves). If the problem is your rings, the "restore" will also make the rings seal better, and it can improve fuel economy while doing do (giving your engine more compression=runs better=uses less fuel. I cant promise it will solve your problem, but IF your rings are the problem, then you would be luck, because that stuff has done miracle cures for me on the past.

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Has the oil been changed lately? A lot of times over filling the oil will cause oil to blow back thru the carburetor, Also if the air filter got caked with mud running the box with no lid or allot of dirt in the filter. The engine will try to use the crankcase breather hose as an air intake since not enough air was coming in the conventional way, therefore sucking in oil. Has it smoked at all? Sometimes if you try to shut it off oil will run back down the intake tubes into the air box. This may be applicable to your engine that the breather is being used to **** oil into the box due to lack of fresh air intake.
The other possibilities would be crank case pressure pushing the oil in (piston ring blow by), but that should (theoretically) result in low compression (since the cylinder pressure is getting to the crankcase instead of staying in the cylinder), the oil is overfull and being pushed out since air will compress but liquid will not, or poor crank case ventilation system design (but if that were the case likely there would be a recall as that would directly effect emissions which is federally regulated).

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I have a Simplicity model 1692762 with a 16hp Briggs and Stratton. The mower blew large plume of white smoke three times while cutting grass over a period of 10 minutes. Engine seemed to lose some power...

I suspect an internal engine issue such as a valve, the white smoke was oil and it could mean a bent, burned valve or damaged valve seat causing the valve stem seal to leak allowing the engine to **** some oil and burn it (the white smoke) and now you lack compression. It is less likely but possible the oil was overfilled and you "lipped" the piston which causes the compression to drop. check the compression, 100-120 is normal, less than that means bad internal parts.

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Blue smoke means oil is burning. The most likely reason is oil is getting past your piston rings because of wear. Run a compression check. If it is less than 150 psi it is time for a rebuild. It may run for a while burning oil and you will want to replace most of the parts anyway so it probably won't cost you much more money to keep running it until it dies. Just keep a close watch on your oil, if you run it out of oil it won't run for more than a few minutes.

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