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Oil found inside intercooler[740-760/1986] posted by nick c. on
Sunday, 17 May 1998, at 11:37 p.m.
This weekend while trying to find the cause of my erratic idle condition in my 765T wagon, I decided to remove the intercooler and noticed a good amount of oil (1/2-3/4 cup) was inside. I replaced the turbo about 3 years ago and the car still runs fine. Is this normal to find oil in the intercooler? What's the likely cause of this and is it an indication that my turbo is going? I plan on using synthetic oil this time to find out if it'll help.
Nick
Re: Oil found inside intercooler[740-760/1986] posted by abe crombie on
Monday, 18 May 1998, at 11:55 a.m.
Oil in intercoolers is normal up to a cetain level. If you get 2 cups or more on repeated exams then you have a problem.
The crankcase is vented through a hose on the inlet of turbo that passes the oil droplet laden crankcase vapors (some oil is not condensed by the vapor separator box on side of block) into intake tract. Thses vapors will cool and will condense into liquid in turbo and in intercooler. If you drive really hard frequently the oil will be blown on through and will never accumulate to any extent.
Re: Oil found inside intercooler[740-760/1986] posted by Paul S on
Monday, 18 May 1998, at 10:33 p.m.
As to idle...it could run the gamut, from old spark plugs, ugly injectors to disconnected vacuum lines or sticking idle control motor. Will take a bit of exploring, but start with the easy things first.
You didn't write how many miles..this could have a bearing on the idle problem and the oil in the intercooler.
The oil in the intercooler is more than likely from your blow by hose...but as others pointed out, even if this is turbo seal escape oil...no bigga deal...if you have say 3 years and 40K on your new turbo and this is all the oil that was condensed in the bottom of your intercooler...then don't worry, be happy.
Oh yeah, I don't think the two are related....
--Paul S. (Mr. Project 245T now, Mr. Dad, Mr. Home project, Mr. Work...)