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You should.... Case in point. I'm selling my 68 912. The car runs and looks flawless. PPi said as much, compression perfect, but the buyer insisted on a leakdown. We found great numbers (2%!) except...one cylinder, #4, was terrible.
Turns out the valve was not seating properly (installation error on a rebuild) and it had 80% leakdown on the exhaust valve. I promise you that you could not tell by driving the car, or oil consumption, or anything... It ran superbly and way stronger than my other 912! Maybe it sealed better warm, no idea... Even my mechanic tried the test a few times because he could not believe it based on how it ran and the other #s... We've repaired it (not bad, one valve) and it's all good. Still from now on I might do a leakdown on a PPI, even if something the results are inconclusive..
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