Question about Subaru Tribeca
No blue smoke and no visible leak
Posted by Anonymous on
Newer cars with catalytic converters will burn oil/smoke that is leaking, so bad piston rings/valves will not show blue smoke.
Posted on Oct 14, 2014
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Posted on Jan 02, 2017
The initial oil leak will most likely be attributed to a worn seal or gasket. I'm sure your aware of this anyway. My concern is that the additives, although advertising a sure fix, may have made your problem worse. I personally don't believe you can buy any product that will fix faulty seals and gaskets as you drive. Typically we as drivers do not pay attention to a fluid leak in it's early stages. There might be a chance that then would be the time that these "gasket in a can" fixes would treat or slow down the leak. What will ultimately happen is the gasket goes bad anyway. Most of us don't notice the drips until they're all over the driveway. You see, if you were adding these things and not actually putting in the proper viscosity oil during this time. The oil got diluted and internal engine component wear may have been accelerated.The internal oil passages can clog and bearing surfaces can lose they're critical tolerances. In many cases causing low oil pressure. Your engine's oil pump pickup screen may be partially clogged with sludge as well after the motor flush knocked all the gunk into the pan.
As for the smoking, the oil rings on one or more pistons probably have broken. Your engine's pistons will have a couple of "rings" that seal the piston in the cylinder. There'll be a set of compression rings and an oil ring. The bottom ring is the oil ring that keeps excess oil out of the cylinder. What happens is the oil ring breaks and allows the engine oil up into the combustion chamber. There it's burned producing your cool James Bond smoke screen. Unless you plan on rebuilding the engine, chances are you'd be better of replacing it with a used one. It's usually much less expensive that way.
My vehicle at the time was a 1990 Acura integra w/200000 miles on the engine. One day as I was happily driving down the road....poof....James Bond!.. Car lost power and I couldn't see for blocks behind me. Didn't need GPS to find my house that day, just had to follow the cloud. This particular vehicle actually never smoked prior to that day. Anyway, I pulled the engine, and took it apart. Sure enough, as I had feared, the oil ring on #3 piston was broken. Ultimately I replaced the engine.
Good luck with yours, and I hope this helps.
Posted on Nov 14, 2008
This means your air conditioner drain tube is clogged. This will take about a hour shop rate to repair or if you look behind the glovebox you will see it. Thanks
Posted on Jun 08, 2009
To begin with, check for fuel in engine oil and do a compression test. If fuel system is not functioning properly (running rich) that will point you in one direction (temp sender, pressure regulator , map or airflow sensor etc) If compression is low, you may have internal engine problem (burned piston, broken ring, or combination of fuel problem causing gas washed cylinders)
Posted on Jul 28, 2009
SOURCE: my 2008 uses a ton of oil also
CHECK FOR OIL LEAKS AROUND TIMING COVER.FRONT CRANK SHAFT SEAL COULD BE LEAKING.OIL FILTER NOT ON TIGHT OR ITS SEAL DAMAGE WILL LEAK.REAR MAIN OIL SEAL LEAKING.CHECK UNDERNEATH CAR YOU GOT A LEAK SOMEWHERE.ENGINE TOO YOUNG TO BE BURNING OIL.
Posted on Aug 25, 2009
Now I am really depressed. We thought we have a change from driving Honda and Toyota so we decided to buy a new 2009 Tribeca. My first oil change for this car was 1800 miles, after breaking in. I replaced it with 7 qts of Mobile 1 Full Synthetic. Currently, the car has 8900 miles, that is 7100 driven; unfornately, I just filled 3 qts of new Mobile 1. Luckily, I check!!! Is this normal for Tribeca? If so, this is the worst investment of a lifetime. I won't ever buy Subaru again or recommend to anyone!!!
Posted on Oct 21, 2009
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The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. This is most frequently seen in older or high mileage cars with worn seals and gaskets. It only requires a very small amount of oil leaking into the cylinders to cause excessive blue exhaust smoke.
Blue exhaust smoke only at start-up can indicate worn piston seals or damaged or worn valve guides which may also cause a rattling noise. An external engine oil leak can drip onto hot engine and exhaust parts causing what appears to be blue exhaust smoke. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure.
Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. In addition, a reduction in power and oil loss can be indicators that the blue exhaust smoke is caused by an internal engine oil leak. Internal engine oil leaks can also allow fuel to mix with the oil in the crankcase which will degrade the oil and prevent it from adequately protecting the engine.
Operating a car with a severely dirty oil filter, air filter or improperly functioning PCV valve can also sometimes result in engine oil blow-by, oil loss and blue exhaust smoke. Periodically checking the engine oil level with the oil dip stick will indicate if there is excessive oil consumption. Higher viscosity engine oil can sometimes temporarily reduce the amount of blow-by; however, this is not generally recommended. Excessive blue exhaust smoke indicates a possible internal engine oil leak that should be inspected by an ASE certified mechanic.
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