02 4.2 low compresson on one cylinder

[Turbo_B5]

Hey on an 02 a6 4.2 what is low compresson on only one cylinder likely to be? rings? valves? walls? It was testing 30 and i added abit of oil, not enough and it came up to 60. Rings?

[RENOxDECEPTION]

Ring land failure, likely.

[glennda5id]

Perform a leak down test.

[Turbo_B5]

Buying the engine this weekend. Will perform a leak down test soon after that.

Really hoping that new rings on the one cylinder will fix the issue. Will keep this thread informed if I remember.


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[RENOxDECEPTION]

Perform a leak down test.

What would that tell him? The compression test number going up with "not enough" oil in the cylinder seems conclusive.

[Turbo_B5]

What would that tell him? The compression test number going up with "not enough" oil in the cylinder seems conclusive.

Two straws worth of oil to be exact. Probably less then that actually made it in. Thus assuming the whole ring wasn't coated in oil cause it's a v8 and slanted.


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[RENOxDECEPTION]

"To be exact"

Anyway, furthers my point. Rings are fucked. Heads probably good.