Diamond Bar Mobil

Great place to take your car for maintenance, repair, tires or smog test. It's a smaller shop so its best to go early as they can get full. They are a STAR smog test station if your smog test requires it. Fuel isn't the cheapest but is reasonable for the area. Convenience store if you need drinks or snacks.

I have a 30ft Class C with a bike rack and 4 bikes hanging off the back. This site is busy with a line of vehicles ready in the queue. My usual smog guy is out in Jurupa Valley with plenty of space to turn, but I wasn't about to drive in the crazy traffic with crazy gas prices. I understand folks complaining about prices, but heck, everything has gone up. I called at 11:15am and asked if they would smog my RV. In my head I was prepared that they would say no because I looked at the google satellite images of the place (still packed) and drove by earlier that morning and saw a row of security patrol cars ready for smog check. I was dreading the drive to and from in traffic back to DB. To my surprise they said they can take me. They cautioned me that they need to move cars to get the RV around the back and they would get it done by end of the day at 6pm. I was like, okay I'll bring by around noon. I pull up at one of the gas stations, walk in and they immediately started paperwork, no sitting around like my usual smog guy, took my info and keys. I was curious how, but I didn't care. I was free from the drive from hell. Sure enough, I parked in a parking lot next door around 5:30 to check them out from a distance. The RV was at the back where a ton of cars were blocking the way. He finished right at 5:57pm and I walked up as soon as he moved the RV to the front. The price was $149 OTD but worth it from a gas and sanity perspective. They were all accommodating and service was immediate (no waiting around for the customer except for the RV to move). There aren't too many places where an RV can pull up in DB, so this is the place for me.

Came in for smog check. Excellent staff and services. Took 15 minutes and they sent electronically the certificate to DMV.
Highly recommend!

Great service! Honest, friendly and courteous staff. Been getting all my cars smog tested in this STAR Certified smog test center for a good 10 years now. If it doesn’t pass, they’ll let you know if there is a problem with your car and they won’t push you to have it fixed at their facility. Although, they are well equipped to get your car working again. But still, it’s up to you if you want them to. Thank you guys and keep up the great work you do!

Very professional and courteous. I was treated with care and kindness.
They were prompt and did an excellent job and gave me a sense of security knowing my car was getting the attention it required.
I can always depend on Justin and all the guys there to take care of my vehicle. These guys are all honest friendly hard working guys. Thank you Justin,Paul & guys.

My tires were low on air, I came to this place (Napa auto care) and they took care of it at no charge. The technician checked all 4 tires and put air in them. Very helpful and friendly service. Thank you Eric for your help!

Nice and professional staffs to do quick enough check on my cars.

Did a great job on my H2 Smog Test. I was in and out fast. They also take great care of my wife's car.

Always great service and fast! Came into the shop for my smog check and everything checked out! I moved from the area but will continue to bring my cars to them! Thank you!

Used them for and oil change then came back for another oil and transmission and rear end service.. they were able to give me price over phone same day service and were so nice throughout it all. I Will continue to use them and never though a gas station could have such good mechanics!!! Thanks guys!!

I always take my car here for smog check. These people are very nice, friendly and honest. You can count on them.

Honest people, reasonable price, professional services. Simply the best auto shop in town.

Been taking my cars for service here for many years, Paul is a very good down to earth person to work with when dealing with auto repair issues.

Paul, James and the rest of the mechanics in the garage are the best in the game! I recommend anyone to take their vehicle to get worked on.

They are very experienced and honest about what's wrong with the car. Paul and the rest of the crew are nice and easy to approach

Great service and quality of work. Not my first car they worked on and will certainly not be my last.

I bring my car here all the time for oil changes. The tech named Jim is very nice and helpful.

Great Smog check! Very nice staff!

It was a hot day and i stopped for gas, the guy gave me a bottle of water for Free ,, thank you sir

They patched a hole in my tire incredibly fast!