So the first time I checked the compression was way back when he M was brought over from my dad’s. It hadn’t actually started yet. The numbers hovered around 180psi. Meh, I knew the engine was a bit worn.

This past weekend, after the oxygen sensor was replaced, I rechecked the compression. This time letting the engine run for a few minutes. Essentially getting a “wet” reading. This time the numbers came to around 215psi. Basically this tells me my rings are tired, but ok. I feel better.

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