Looking at a 05 S4 Avant for sale, far away from me. Had a PPI done including compression+leakdown tests.
Compression all came back OK (max-min difference was 15psi)
Leak down however, got numbers between 12% and 30%. And this is what is throwing me.
From low to high: 12, 13, 15, 15, 15, 17, 25, 30
I know compression results are more about the difference rather than the actual number due to different factors in battery, temperature, dry/wet, yadddayadda
On the other hand, I thought leak down was a bit more “repeatable” since it was static test. Are there factors that would significantly move the baseline (from what seems to be the typical 1-4%) up to that 12-15% range? It seems odd they were all over 10% when everything I’ve dug up on other leakdown on a b6/7 s4 seem to have the vast majority well under 10%.
I don’t know the specifics of how long they held the test and that is all I can think of as the reason. I know you can’t hold pressure indefinitely and you will lose some eventually.
So am I just trying to reason myself into a new-to-me car or are there legitimate concerns with those leak down numbers? FWIW the shop mentioned the spark plugs were pretty dry, and the exhaust tips/back end of the car wasn’t oily (at the time) so that’s a plus. Current owner (wolfs4) claims ~1qt/5k miles oil consumption which doesn’t seem bad but I -or the shop- cannot verify this during a simple PPI, obviously.
Many thanks