They are very honest. Thought I had major oil leak turned out last place ( pep boys) did not put washer back on oil plug. With oil all over the place when I first took it to Choi he thought maybe needed to change all the gaskets turns out it was the plug. Huge savings others might of stuck to replacing all gaskets.

Quality service thats reliable and affordable. Located more inside of the plaza, they do both auto service and oil changes. Nice people too.

Great service

Ive been going to Choi for years -I rarely give out 5 stars for businesses, but for Choi, he and his technicians are mechanics that definitely deserve it.Ladies.... this mechanic is honest, reliable, and so friendly. I highly recommend Diamond Bar Auto Service for all of your auto repair needs.Keep up the excellent work Choi, God Bless you.

Fantastic!!

Good!!!!

Very kind