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1. It means your engine is fine.
2. Compression measures the air pressure the cylinders create as they cycle. A leak down is the opposite, it puts compressed air into the cylinder and measures leakage.
3. Not likely, has your engine had a life changing experience in the last 10,000 miles? Just drive it.
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84 Cab - sold!
89 Cab - not quite done
90C4 - winter beater
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