u don't understand 怠速.
all new cars today will use computer to control 怠速.
when the car is cold, it will get more gas to warm the car quickly, that's why 怠速 is high when u just start up a cold car.
怠速 should be around 600 RPM after car is fully warmed up.
2.engine上要求5W 30机油,故不建议用合成油,而用好些的油.如local开的多换勤些.
totally non-sense logic.
always use 合成油
3.每20Kmile要清engine,清coolant.老师傅告我他的lexus 200K都没换water pump.coolant会污染是吧?
what do u mean by 清engine??
lexus 200K都没换water pump? crazy.