Dave Modderman has kept our Porsche's maintained and running like new for over 15 years. Outstanding!

Have had great experience with Modderman! I was impressed that there was discussion about maintenance that didn't result in extra service. Benefits and risks were discussed, and a more strategic plan on how to address the ongoing needs were decided on. Felt like I got clear advice and I was in good hands.

david and staff are class acts. Friendly and accommodating.

Over a few years now, I've trusted Dave and his crew on their advice/recommendations, workmanship and attention to detail, and I've never been disappointed.

I had an excellent experience working with Dave and his shop to resolve a very nagging and tricky check engine light issue on a '98 993. I tried two very reputable shops near San Mateo multiple times over 2 years and neither could resolve the problem without proposing expensive replacement of parts only in the hopes of solving the problem - nothing gauranteed. I even had one Porsche shop refuse to take my car because they didn't have the patience or interest in helping me out once they knew the issue. Dave and his team efficiently and inexpensively went about troubleshooting the problem in a smart experienced way and ultimately diagnosed and fixed the problem. I went to Dave because of his excellent Google reviews; his excellent reputation is spot on. I highly recommend Modderman Services. They know what they're doing.

Dave and his team at Modderman fixed a very tricky Check Engine light problem on my '98 993 that multiple shops (including a dealer) in the Bay Area couldn't resolve. One Porsche shop wouldn't even take on the problem - too difficult to solve. Off and on I spent two years having shops take a stab at resolving the problem. When they couldn't accurately troubleshoot the problem the proposal was to start replacing expensive parts in the hopes of permanently clearing the problematic load sensing code. Just costly guesswork. I finally found Modderman through their excellent Google reviews. They nailed the problem and fixed it in an efficient and inexpensive way! I couldn't be happier with my experience with Dave and Modderman Services. If you've got a tricky issue with an older Porsche I highly recommend Modderman. They truly know what they're doing!

Modderman changed the timing belt on our 944, replaced the clutch hydraulic slave cylinder and as a bonus solved an issue with the complex sunroof that didn't want to latch. Dave showed me the removed parts and made sure I was happy with the work performed. The car has been great to drive since then. I plan to bring in my 911 next- very happy to have such an experienced and helpful shop team in the bay area.

Dave and his team are excellent! Great service, knowledgeable and helpful. If you need a Porsche specialist they are your guys.

My 1985 Porsche 944 timing belt was replaced perfectly and the team at Modderman even sorted out the malfunctioning sunroof for me. True experts!