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Old 10-10-2011, 09:55 PM   #1 (permalink)
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Default my car is eating oil...why?

so i have a 1990 with no motor modifications and i drive it like i stole it. it eats oil faster than i can pour . no spots on the driveway and cant see much on the motor. Exhaust blows white/ darkish smoke when I rev it.

Im thinking it could be the head gasket but want to make sure before I fix it. Any ideas would be awesome
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Old 10-10-2011, 09:57 PM   #2 (permalink)
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what kind of an idiot would put a fwd engine in a rwd car?
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Old 10-10-2011, 09:57 PM   #3 (permalink)
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Default Re: my car is eating oil...why?

Mileage?
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Old 10-10-2011, 09:58 PM   #4 (permalink)
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Thanks bronto. I didn't want to be the one to do that, but it was tempting.
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Old 10-10-2011, 10:03 PM   #5 (permalink)
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Default Re: my car is eating oil...why?

worn out piston rings

does it smell like burned oil?
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Old 10-10-2011, 10:10 PM   #6 (permalink)
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Default Re: my car is eating oil...why?

now me and the mad scientist gotta rip apart the block, and replace the piston rings you fried

i have the same problem, its 99.9% likely to be hile-mileage induced wear on the piston rings and valve guides. now you have 2 options:

1) feed it oil like crazy and deal with it, potentiallly fail smog, and drive it into the ground
2) fix it. this entails either a new/rebuilt swap or repairing your own by completing every long laborous step of an engine rebuild, and since it will cost about $1000 in labor, you may as well rebuild it while you're there.
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Old 10-10-2011, 10:12 PM   #7 (permalink)
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Default Re: my car is eating oil...why?

if it has recently been rebuilt, however, and its doing this then that means whoever did the rebuild is an idiot and put the piston rings on upside down, specifically the oil retainer, which is the fat one on the bottom. yes, they are direction specific.
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Old 10-10-2011, 10:32 PM   #8 (permalink)
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Default Re: my car is eating oil...why?

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Old 10-10-2011, 10:34 PM   #9 (permalink)
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Default Re: my car is eating oil...why?

piston rings. i'll bet a paycheck on that especially if you drive it like you stole it, then i'll double down
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Old 10-10-2011, 11:20 PM   #10 (permalink)
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Default Re: my car is eating oil...why?

Maybe bc of you're sn?
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Old 10-10-2011, 11:40 PM   #11 (permalink)
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Default Re: my car is eating oil...why?

I eat a few quarts every thousand miles or so, 180k and run delo 400 15w-40. You like me, are in a dire need of an engine rebuild.
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Old 10-11-2011, 12:41 AM   #12 (permalink)
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Default Re: my car is eating oil...why?

Fat engines are always hungry.
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Old 10-11-2011, 10:43 AM   #13 (permalink)
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Default Re: my car is eating oil...why?

ok so i ran the car this mornign just to be sure and the smoke isnt black its white. while the car was warming up it was spitting this black sooty water onto the ground. didnt smell like anything.

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Old 10-11-2011, 10:46 AM   #14 (permalink)
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Default Re: my car is eating oil...why?

damn
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Old 10-11-2011, 10:47 AM   #15 (permalink)
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Default Re: my car is eating oil...why?

burning oil would give you white smoke with a blue tint/hue. black/sooty smoke is from running too rich. In to find out, my car spits this shit out but much less. I think its valve retainers/seats.
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Old 10-11-2011, 10:59 AM   #16 (permalink)
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Default Re: my car is eating oil...why?

it's hungry.
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Then godspeed, little moron.
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Old 10-11-2011, 11:23 AM   #17 (permalink)
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Default Re: my car is eating oil...why?

Yeah..ull have that
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Old 10-11-2011, 11:25 AM   #18 (permalink)
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Default Re: my car is eating oil...why?

Damn! your car is ill...go to a doctor! ^^

engine rebuild or just buy a used engine
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Old 10-11-2011, 01:00 PM   #19 (permalink)
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Default Re: my car is eating oil...why?

yea, so I have done some more reading about this and I am about 90% sure its valve seals.

I have good compression (valve seals won't show up on compression tests, but valve SEATS will) and will do a leakdown test in the next few weeks just to make sure there won't be any other surprises. but I still eat through oil at about ~1 quart every 400 miles.

good thing though is valve seals are cheap...but I get the feeling I will need to replace a few more things in the head, just hope my piston rings are doing ok.

http://forum.miata.net/vb/showthread.php?t=286393

there is a couple more links I can pull up, but I gotta get back to work.
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Old 10-17-2011, 03:05 PM   #20 (permalink)
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Default Re: my car is eating oil...why?

if you take the head off, is a good time for a port and polish.
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yet you dont post specs; in the fitment thread. in fact, your picture is so instafaggy that you cant see a god damn thing about the fitment
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Old 10-17-2011, 03:09 PM   #21 (permalink)
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Default Re: my car is eating oil...why?

when in doubt seafoam it.....





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Old 10-18-2011, 11:55 AM   #22 (permalink)
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Default Re: my car is eating oil...why?

^haha that should yield some interesting results

if your oil is "disappearing" without obvious leaks, its likely burning at the top rpms. Have you resealed your engine?
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Old 10-18-2011, 12:10 PM   #23 (permalink)
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Default Re: my car is eating oil...why?

get the head off, take the cams off, take the lifters out, buy new valve seals, get valve job, machine it, new head gasket, put it back together!
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Old 10-18-2011, 12:15 PM   #24 (permalink)
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Default Re: my car is eating oil...why?

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Originally Posted by oileater View Post
ok so i ran the car this mornign just to be sure and the smoke isnt black its white. while the car was warming up it was spitting this black sooty water onto the ground. didnt smell like anything.

http://i9.photobucket.com/albums/a57...011_083302.jpg
Sounds to me like your headgasket is toast! One way to check is to look at the oil cap and see if there is a milk like substance on it. Also, check your radiator coolant for oil residue. Someone mentioned earlier that piston ring damage produces a bluish smoke. Headgasket failure produces white smoke. I'm almost certain that at some point in the vehicle's life, it was overheated one too many times. Good luck!

EDIT: Seems like Phung018 beat me to it!
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Old 10-18-2011, 12:56 PM   #25 (permalink)
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Default Re: my car is eating oil...why?

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Originally Posted by RedemPhex View Post
yea, so I have done some more reading about this and I am about 90% sure its valve seals.

I have good compression (valve seals won't show up on compression tests, but valve SEATS will) and will do a leakdown test in the next few weeks just to make sure there won't be any other surprises. but I still eat through oil at about ~1 quart every 400 miles.

good thing though is valve seals are cheap...but I get the feeling I will need to replace a few more things in the head, just hope my piston rings are doing ok.

http://forum.miata.net/vb/showthread.php?t=286393

there is a couple more links I can pull up, but I gotta get back to work.
Water is a combustion by-product of gas burning in the engine. Excessive black soot is an indication of the engine running rich but most exhausts pipes have a little black build up on the wall of the pipe. Sounds pretty normal to me (to a degree) as long as the soot isn't excessive. You could back probe your O2 sensors and see what the fuel mixture is actually doing. Just an opinion.
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Old 10-18-2011, 01:04 PM   #26 (permalink)
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Default Re: my car is eating oil...why?

Its a valve seal leak/valve guide leak. I did some spark plug investigation and my cylinder 2 is experiencing oil burning deposits on one side of the spark plug (which is indicative of oil coming from valves and not piston rings. Also my great compression numbers are indicative of a leak external to combustion chamber). add on my oil consumption and the fact that I spit unbelievably sticky and staining oil on the ground in the mornings and I am 100% sure its valve seals/guides.
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Old 10-18-2011, 01:29 PM   #27 (permalink)
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Default Re: my car is eating oil...why?

Not driving it like you stole it all the time would certainly slow the oil consumption a bit. Sounds most likely to be worn rings and/or bad valve seals.
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Old 10-27-2011, 11:28 AM   #28 (permalink)
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Default Re: my car is eating oil...why?

Good time to do a 1.8 swap?
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