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Discussion Starter · #1 ·
Do you have a leak that is going down the engine side, or it’s showing up in the bottom cover when you go to change your oil or see it on the sides of the engine when the top cover is removed? This leak is most likely due to the Valve Cover and Oil Pressure Regulator gasket haven shrunk over time and now letting oil by.

This video will show you how you can do this on your own and how simple it is.

This applies to 2.5L 4-cylinder engine, which can be found in 2014 to 2020 Mazda 6, 3, CX-5.

Parts used were Mazda OEM Parts.
Oil Pressure Regulator Gasket PY01-10-235
Engine Valve Cover Washer Seal PE01-10-2D5

Equivalent Alternative Non-Mazda parts for:
Engine Valve Cover Washer Seal
Grey RTV

If you are doing this fix, you must be at 100k miles or close to it. Then there might be other items that you should be checking right now as well:
-make sure water pump is not leaking: HERE is the thread
-belt tensioner: HERE is the thread
-check belts: HERE is the thread
-if you are at 100k...might want to change coolant and brake fluid too.

Please check out the other videos in the Mazda 6 Playlist:

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