Hi i did a compression test on my a12 today because is uses alot of oil but drives fine other wise

i did a dry and wet comp test and got these results

cyl 1 183psi wet 250 psi

cyl 2 162 psi wet 250 psi

cyl 3 173 psi wet 218 psi

cyl 4 174 psi wet 226 psi

so to me the dry test dosnt look so bad but the wet test there's around a 67psi difference which is quite large

is there any reason as to why the dry looks reasonable but wet test shows excessively worn rings? i was suspecting lower dry test than these reults

it uses alot of oil at high speeds on the freeway 120-130km/h i can go from full oil on the dipstick to around half in 100km

but it does have 600,000km on it original and was over heated badly by previous owner which is why cyl 2 is low on comp as the piston did scuff the bore leaving behind a bit off alloy on the bore.

Thanks!