I pulled a Toyota engine out of storage, had been there for years on a pallet. i was changing all the seals before installing it in the car, and checked the compression by turning it by hand and there was NO compression. an old guy suggested putting marvel mystery oil into the cylinders via the spark plug holes. i did that and the compression came back. the old guy said if the engine sits for along time the rings get stuck on one spot and stop making contact with the cylinders all the time. some lubricant on the tops of the rings fixed that.

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