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Where could this oil leak originate on this Mazda 6?

Motor Vehicle Maintenance & Repair Asked on November 28, 2020

2007 Mazda 6 3.0L V6, driven daily, has been dripping a few drops of oil per day from this … what the heck is this bent piece of metal that looks like it actually has a drip spout? And where is the leak likely to be originating and what are recommended diagnostics or repairs?

Mazda 6 Undercarriage

Oil leak point

Oil leak point detail

One Answer

That looks to be where the transmission bellhousing meets the engine block. If that's the spot, the leak is most likely the rear main seal. This is where the engine crankshaft comes out of the engine and the place where the flexplate (assuming an automatic transmission) connects to it. There is a seal which circles the crankshaft. A leak where you're showing it is usually caused from this seal leaking.

This is not an easy fix, because one has to remove the engine/tranny from the car (most front wheel drive cars requires this), then split the tranny and engine, remove the parts, replace the seal, then put it all together again. A lot of work for a $20 seal.

Answered by Pᴀᴜʟsᴛᴇʀ2 on November 28, 2020

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