Which of these are more indicative of engine health? Should both be done as a cross functional check... or is one better than the other.
Just to note, I haven't had any problems, but just out of curiosity I would like to have my engine tested to see where I stand.
I know Pepboys sells a do-it-your-self tester for I beleive compression testing, is this thing worth the trouble? Should I just take the car to a professional shop and have one or both done?
Opinions, facts, ideas are welcome...