The most left bolt and the middle one is dripping quite a bit of oil. The oil cooler block off piece did not stop the leak. I'm stumped, the leak is the same as it was before I did the gasket and I've done it twice. Most oil pan bolts are tightened to between 25 and 27 foot-pounds. That’s INCH pounds. When they rebuilt the engine they recommended and installed a competition oil pan gasket. I'd drive the car and see small drips under the car. Tighten the bolts in a pattern starting from the middle of the pan to the outer edges, along the long sides of the pan -- tighten the short sides of the pan … In a few cases, I have used lock washers on the bolts. Please do not do this. this would eliminate these kind of problems as far as the gasket getting messed up. When installing the pan with a new gasket, progressively and CAREFULLY tighten all the bolts until the taps just come in contact with the transmission housing (see image below). I still got leaks. Unfortunately, even after tightening the bolts, oil continued to leak when the engine was warm. I have a 1990 190E 2.6 and it started leaking oil like a sieve from the rear of the pan. I crawled under and tightened the pan bolts and found that the two rear-most bolts were stripped. I'd get it on the lift and see oil on the bolt heads, dripping off to the floor. There is a high probability of breaking a bolt off in the block, and then your expense significantly increases. For this reason, many hobbyists who see dirt and oil film on the outside of an oil pan or valve cover with a cork gasket believe that it is leaking, and consequently over-tighten the hold-down bolts. I thought the oil was leaking from my transmission, but the shop said it was coming from my oil pan gasket. I've always used a windage tray. Oil pan gasket leaks are extremely common in E90 series xi's. Suggest to be very careful to usethe correct torque if you try tightening the bolts. Re: How tight to tighten oil pan bolts?? This will not stop the natural wicking process that is responsible for the dirt accumulation. I have dealt with slight oil leaks with my 3 different 440 engines. 4wd Hardware and CarQuest sell nice neoprene and steel 1piece pan gaskets. the car quest one has a steel insert and all but impossible to over torque. Overtightening the oil pan bolts may deform the pan surface, and then it will never be possible to stop it from leaking until you get a new pan. To me it seems that the front three oil pan bolts are leaking (see attached picture). How to repair oil leak in car engine drain bolt. When I brought the car in the week before last, the shop re-torqued the bolts on my oil pan, put dye in my engine oil and cleaned the affected areas. Wiped clean the area and gave her a day then looked again. How to repair oil leak in car engine drain bolt. The bolts are aluminum, torque to yield bolts. 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