[lvporschepilot]

Also note that different leakdown testers can post different results. An older Snapon Mt324 is the most sensitive tester I've ever seen, and any number under 15% is great with that particular tester. Same cylinder tests at 6% with a different brand 100psi tester.

Let's not all beat ourselves up over leakdown testing being under 5% etc too. The FAA leakdown standard is very specific, anything under 25% is airworthy using a tester with a .040 aperture and 80psi. The lower the psi tester, the higher the leakage shown on the guage is my experience. So a 15psi tester showing 20% leak is not the same as a 100psi tester showing 20% leak, they will show totally different results. It's all a bit fuzzy using such low psi as well considering peak power is generally over thousand psi in any given cylinder, so how is just 80-100psi going to tell us much. It's better than nothing, just keep an eye on peak power and oil burning.

But I digress;yes, you can expect a difference once the rings have seated and everything is up to temperature.