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Re: oil leak from behind the fuel sytem
Assuming that the drain bolt is tight, is there damage to the oil pan? If so, that could be the source of the leak. A gallon a week is the fuel contents of the oil system so it needs to be fixed ASAP. I would put some cardboard under it and watch for the drips to start forming and follow them back up. I would also check for a loose oil filter or a pinhole in the oil filter case.
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Whats the milage on it?
you seem to have a serious leak, have you checked if it leaves an oil puddle after you parked overnight, if not, try that next morning.
Is is burning oil, do you see blue smoke come out of the tailpipe, if you do, then you are seriously burning oil, engine is asking for an overhaul...
There is fuel leaking outside the engine. Possible areas are the tank itself, fuel lines and fittings, and the fuel filter. These usually cause puddling under the vehicle. However, if fuel is leaking onto hot exhaust system parts, it will vaporize and leave no puddle. Find and fix the leak.
There is fuel leaking inside the engine. This is usually from a fuel injector that is leaking fuel into one of the cylinders. The engine will run rich and burn extra fuel. The fuel leaking past the rings of the piston in the cylinder involved will contaminate the engine oil and give it a fuel odor. The contaminated oil will not lubricate the bearings properly and more engine troubles will develop. Find and replace the leaking injector.
Fuel may be being burned due to an unnecessary rich mixture caused by a malfunctioning oxygen sensor. Oxygen sensors are usually designed to fail to the rich mixture side. Failing to the lean side would cause engine damage. On the rich side, the engine is protected from damage although fuel mileage will suffer. You may see black smoke while accelerating and a sooty carbon buildup on the inside of the exhaust tailpipe. Test the oxygen sensor and if it fails, replace it.
Usually leaks at the front or back of the engine are from the oil pan. Sometimes you can slow the leak, or possibly stop it, by tightening the small bolts around the perimeter of the oil pan. These are probably 7/16 or 1/2 inch bolts. You didn't go into much detail about what kind of leak you have, so I am assuming it is a very thin puddle of engine oil. If it is automatic transmission oil your car will stop moving eventually.
jack up the car and look underneth it , if it is a large amount it is probaly a front or main seal and a lot of work, if it is a small amount you need to tighton the oil pan the bolts tend to come lose overtime and need to tight
could the clear oil actually be water?. if it is leaking out in the area around or behind the passenger side front wheel on hot days, it is probably water from your A/C, system. it has an overflow or drainage pipe, as the process of cooling the air dehumidifies it and produces water. just a guess though