An oil leak at the very back of the engine, dripping from the bellhousing area, is usually the rear main seal — the crankshaft seal where it exits into the gearbox.
The catch is access: it sits behind the flywheel, so reaching it means separating the gearbox and removing the flywheel — which is why owners almost always do the rear main seal as part of a clutch job rather than standalone Clutch Replacement.
The front main seal (c
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