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Home >> BMW >> 1989 >> 735iL >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Overhaul - ZF 4HP22 & 4HP24 >> Trouble Shooting (ZF 4HP 22H/Eh) >> Leakage >> Oil Loss Through Or On Vent

Oil Loss Through Or On Vent

Oil level too high. Wrong oil (strong foaming). Vent cap missing. "O" ring on vent damaged. Preload of circlip insufficient.