Yes. Do both dry and wet compression test.
Sa dry testing, check mo kung pantay ang reading. Variance should be around <10% per cylinder. Record you readings.
Then do wet testing by squirting motor oil sa spark plug sockets. Kung gumanda ang reading (tumaas substantially), you have worn out piston rings. Need to do overhaul.
Kung mababa pa din reading after wet testing, you have sirang valve seals. Top overhaul.
Kung dalawang magkatabing cylinder magkaparehong mababa, you have warped cylinder head and/or head gasket. Top overhaul plus head shaving sa machine shop
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