compression check

[Redfox]

I did a dry compression check on my buddies 3.0. The results were 150 on 5 cylinders and 132 on the 6th. Squirted oil in all six cylinders and and it showed 150 on all all six cylinders. The engine has been running fine. what could cause the difference?

 

[JCyr8511]

piston ring wear will cause the difference....along with valves not seating 100%....head gasket leaks will cause lower compression, but then you probably would've seen less psi on at least 2 cylinders....probably just some worn rings...not a bad thing at all though