Burning oil??

[burton95p]

hi i have a 96 sl2 and i have been burning about a quart of oil every 1500 miles, this has been this way since it was new i was told from the last owner. I have read that these dohc engines are notorious for burning oil, i have done a compresion test and iam 102-103 in every cylinder, and i know factory is around 98psi, i do not have smoke coming out of my exhaust, and never have seen any, if u didnt know it burned it you would have no idea of knowing. anbody else have any problems with this? and way to reduce consumption.

[sl2racer]

no i believe factory piston compression is 220psi . if you have that low of compression you have badly worn rings. also how many miles are on the car. the valve seals tend to wear out kinda fast too.

[saturnspeed_12]

no i believe factory piston compression is 220psi . if you have that low of compression you have badly worn rings. also how many miles are on the car. the valve seals tend to wear out kinda fast too.

i was thinking it was like 210? oh well, yeah your compression is way off. your rings are gone it seems to be. not literally

[burton95p]

sorry i meant to say 205 psi, according to my manual 190 is standard and 180 is the service limit

[burton95p]

110,000 miles

[saturnspeed_12]

haynes manual? if so might as well throw it away.

but did the compression build up to 205 or did it jump straight to 205? i bet its still the rings.

[burton95p]

it went up to 205 right away

[saturnspeed_12]

well it wouldnt hurt anything to do a piston soak.

[burton95p]

piston soak??

[TheMU47]

according to my manual 190 is standard and 180 is the service limit

That's about right. 210 would be a fresh engine, or one with alot of carbon built up in it.

They all burn oil. There is a flaw with the piston design that allows too much oil to get into the chamber.

a 205 compression is good.

[saturnspeed_12]

according to my manual 190 is standard and 180 is the service limit

That's about right. 210 would be a fresh engine, or one with alot of carbon built up in it.

They all burn oil. There is a flaw with the piston design that allows too much oil to get into the chamber.

a 205 compression is good.

yes i was right [img]{SMILIES_PATH}/biggrin.gif[/img] lmao, i thought it was 210 fresh out of the oven.

oh yeah and about a piston soak, its simple. the hardest part is figuring out what solution you want to use to do it. you have marvel mystery oil, gm tec, and sea foam. ive used sea foam and marvel mystery oil. but what you do is pour some of the solution into the cylinders (i normally do just enough to cover the pistons, others tend to really drench the cylinders). since i normally put just enough into the cylinder to coat the piston, i keep checking mine to see if i need to fill the cylinders up with more. i never do. but also some do this while the engine is still warm and put the spark plug back in to keep the heat in. ive done that too. i usually let my car set for at least 12 hours before starting it. but if you put too much into the cylinders, or theres quite a bit left over, then you will need to crank some of it out with the spark plugs removed (pull fuel pump fuse and ignition module connection below coils) and put rags over the plug wells so you dont have fluid shoot everywhere. once thats done but it back together and crank it up. now you could have quite a bit of smoke come out from the solution, or like me where i somehow always put just enough in, the car starts smooth and doesnt smoke one bit at all.

[mjzzyzoff]

coincedence i asked u about this last night? i think not...

fate again. come help me ian.

[saturnspeed_12]

oh molly, when dont you need my help? [img]{SMILIES_PATH}/lol.gif[/img]

[S.Bretz]

Sounds like rebuild time.

[lpredline6986]

How do you check the compression of the cylinders?