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Old 11-24-2017, 12:22 AM   #1
Hackettbr1
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Default Randomly Burning Oil

year 97
Model SL
Engine 1.4L SOHC
Automatic Transmission


Occasionally when driving, or just starting her, I burn a ton of oil. no signs of leaks or a bad PCV valve, i dont stall wheb it happens, rpm tends to rise a little though. over the past week I've added about 1qt of oil and it's getting rather expensive to maintain. any suggestions on what could be causing it?

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Old 11-24-2017, 01:09 AM   #2
pierrot
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2000 L-Series 2.2L Sedan
Default Re: Randomly Burning Oil

Providing maintenance history and mileage would be helpful to other members. BTW, did you really mean to write "1.4L SOHC?"

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Old 11-28-2017, 12:01 PM   #3
DonP1
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1999 SL2
Default Re: Randomly Burning Oil

Quote:
Originally Posted by Hackettbr1 View Post
year 97
Model SL
Engine 1.4L SOHC
The engine should be 1.9L.

Quote:
Originally Posted by Hackettbr1 View Post
Occasionally when driving, or just starting her, I burn a ton of oil. no signs of leaks or a bad PCV valve, i dont stall wheb it happens, rpm tends to rise a little though. over the past week I've added about 1qt of oil and it's getting rather expensive to maintain. any suggestions on what could be causing it?
Without knowing more, my best guess would be the piston rings are letting oil get past and burn up.

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Old 11-28-2017, 12:58 PM   #4
alordofchaos
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1998 SL2
1997 SL2
Default Re: Randomly Burning Oil

Quote:
Originally Posted by Hackettbr1 View Post
Occasionally when driving, or just starting her, I burn a ton of oil.
Do you mean your oil burning is not constant - sometimes, you burn very little oil while other times you burn a lot?

Or do you mean you only occasionally check it and it was down a quart last time you checked?

You may want to start an "oil burning log" - put your oil at the FULL mark. Park each night in the same spot on a level surface.

Each morning, check your oil level and note how many ounces are required to bring it back to full (per OldNuc, each diamond on the dipstick is 3.2 oz) and how many miles you travelled the previous day.

This may reveal some oil burning patterns, and will give you some way of portraying how much oil you are using.

Saying, "I added a quart" doesn't tell us anything. . .
If you started off with oil full, drove 200 miles and were a quart down - that's a lot of oil burning. If you started off with oil full, drove 7,000 miles and were a quart low, that's better than most.

(also, don't let your oil get that far down before adding - I check and top my oil weekly, which is about 200 miles, and need to add about 3~6 oz a week of oil.)

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Old 12-03-2017, 01:27 PM   #5
Saturn Night
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1995 SC2
Default Re: Randomly Burning Oil

Some excellent pointers are made here, and chaos has probably the best suggestions.

As far as where the oil is burning? It could be the rings, as they are known for seizing up. Another area that can cause oil consumption issues are the valve stem seals.

The second one has some symptoms that make a guide for determining which ones(or both) are the culprit.

With worn valve stem seals, you may see some blue smoke at startup, after periods of long braking/deceleration as you hit your gas pedal to accelerate, or small puffs of blue smoke when leaving from a stop. You will also see a steady amount of steam, from the oil fill cap, after removing it from the engine when you have just shut it off from driving.

The rings typically will not produce as much smoke, until you get down to about 1 quart of oil to about 400 miles(or less) or driving. Usually, when the rings are fully damaged, the engine will have blue smoke fairly consistently, throughout the RPM range and driving conditions. Steam may appear from your dipstick, if you remove it to check you oil level per the owner's manual(which is after 5 minutes of sitting upon shut off).

Until you are able to perform a further diagnosis or proper repair, you may try to use lower costing oil. Please note, this will not correct the issue. It will merely reduce the cost of maintaining your oil level, until the correct repair can be performed.

I use Shell Rotella T 10w-30, T4 conventional, as my 1995 SC2 uses 1qt per 100 miles of driving, and a gallon jug retails for $13.99-18.99.

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Old 12-05-2017, 01:15 AM   #6
Mister_Cee
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1996 SW2
Default Re: Randomly Burning Oil

Maybe I missed something. What kind of driving did you do during the week you mention?

If I'm driving around town, my SW2 uses very little oil.

If I'm, driving on the freeway, the oil usage seems to rise as the engine RPMs increase.

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