I've been going to this dealer for years, and my husband and I are both on our second Lexus'. I usually buy my own oil and OEM parts, and the mechanic just charges me labor. They're not known for their customer service, but they are very trustworthy and liable. You may have to leave your car there for the day and pick up in the evening.
Auto USA
621 West Duarte Road
Monrovia, CA 91016
(626) 303-3026