It looked like the hose had been rubbing on the oil filter housing and had created a hole. Strangely, the hose wasn''t really touching the oil filter housing at that time. I decided to check our online technical information source for a BMW factory technical service bulletin that could shed some light on this problem.Great! There was a bulletin that covered this exact problem and here''s what it described:Some BMW M3 models, produced from September 1995 through June 1996, equipped with the M54, S50, or the S52 engine, may have an upper radiator hose that can come in contact with the oil filter housing only when the engine coolant is at operating temperature. The contact is due to coolant system pressure and expansion of the hose.Checking airtools the clearance between the upper radiator airtools hose and the oil filter housing must be performed when the engine is cold.

It looked like the hose had been rubbing on the oil filter housing and had created a hole. Strangely, the hose wasn''t really touching the oil filter housing at that time. I decided to check our online technical information source for a BMW factory technical service bulletin that could shed some light on this problem.Great! There was a bulletin that covered this exact problem and here''s what it described:Some BMW M3 models, produced from September 1995 through June 1996, equipped with the M54, S50, or the S52 engine, may have an upper radiator hose that can come in contact with the oil filter housing only when the engine coolant is at operating temperature. The contact is due to coolant system pressure and expansion of the hose.Checking airtools the clearance between the upper radiator airtools hose and the oil filter housing must be performed when the engine is cold.

Mark/B-LOC: For most applications, installation according to the manufacturer''s instructions is all that is needed for a permanent, fully adjustable, and removable backlash-free connection. For keyless locking device connections in extreme operating environments, use packing grease and inexpensive cover plates to keep out dirt, moisture, and other corrosive elements.Andrew/Whittet-Higgins: Continually educate technicians on quality and working efficiency. A balance of quality and quantity will maximize the life expectancy of each assembly and the enterprise as a whole.Blair/Ruland: When servicing equipment, inspect the locking device for any signs of slipping and tighten the clamping screws to the recommended seating torque when necessary.When replacing a locking device, end users should follow the proper bolt-tightening pattern. Tighten the same way you would mount the wheels on a car: Tighten opposing screws, working airtools your way around the locking device. This reduces misalignment and provides the best holding power.