AOA. I am driving Toyota Vitz 1k 2015 model. Engine head compression is 1oo to 110. What it should be can anyone advise. My car loose power after 15 min drive. Not much vibration issue. Using shell 5w30 HX 7 plus engine oil. Feel knocking at lower rpm sometimes. Got checked everything. 14 to 15 avg within city without ac. With ac it gets down to 11 to 12. Mechanic says engine is weak. Do continue using like that? What dhould i do?
