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Re: blowing oil and smoke
When overfilled, how long before the level was drained back to normal, or was it? The problem with overfilling, is that the oil will 'foam' and not lubricate properly. This can result in serious engine damage. So, make sure it's at the proper level now, if it is, I believe the engine was damaged due to lack of proper lubrication. Wish I had better news. Good luck.
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There are some decent diesel fuel additives that may clean the system to diminish your smoking. BG makes some good products. Look for DFC plus fuel conditioner, part number 248. Also scan for fault codes. Sometimes there may be a fault code even with no CEL on.
Any oil that was in the head will seep into the piston head over time and this will blow black, but should stop after 1 min.
If this happens over and over with starting every day its a bad seal on your piston rings, this has nothing to do with the air filter.
If your car has sat for that long you need to change the oil asap as oil and gas will go bad after only a few months gas 4-5 months oil will go bad after 3 months or if it has gotten very hot.
Change oil and test to see if your still blowing black if so go get a compression test done that will tell you if your rings are gone.
Ring jobs can be very costly, hope this is not the case.
if the smoke is coming from the engine bay, check for spilt oil or an oil leak, especially on the exhaust. clean/fix this and the smoke should stop.
if it is coming from the exhaust, check you have used the correct grade of oil (too thin oil may bypass oil seals slightly) and you have not overfilled the engine and this can cause internal pressure, causing oil to bypass the seals, or even blow oil seals completely. overfilling will also damage the catalytic converter.
It sounds like it could be overfilled, but that will be easy enough to check on the dipstick. Should be checked with the engine idling in neutral. Otherwise, the trans could be overheating, causing the oil to expand to the point that it spits out the breather. Pull the dipstick and check the fluid condition, if it's dark and smells burnt, the trans may be slipping or overheating for some other reason, and it's probably time to get a trans shop involved. You should probably run an auxiliary cooler at the radiator area in the type of application you describe, especially if you're gonna be using the gas pedal fairly heavily! Sounds like a sweet car, lots of fun to be had in something like that.