Kanamighmn16

 The main oring is 1) old, reused and has "squared" 2)incorrectly installed oring on the oil filter cap 3)has snapped during reinstallation of the oil cap 4)not there Either one of these scenarios will cause this issue Another issue that can happen, although not very common Is that the cap has cracked due to over tightening HTH's Welcome Josh If it is engine oil and not gear oil and you can tell by the smell, there are only 2 places that can come from The rear main seal or the Oring that seals the spline shaft and the clutch housing The rear main can can leak and run down the back of the engine in front of the bell housing and seep out there very easily Bmw oil filter o-ring leak