Most car owners figure this out quite quickly after warranty expires - the dealer is the most expensive place to go when you need basic repairs and service. They service department at the dealership doesn't want to 'repair' your car, they want to sell you new parts, rather than take the asssembly apart and fix the smaller issues.

But finding a dedicated, nearby after-market repair shop in Thailand can be a challenge if you don't speak/read Thai. I tried the facebook groups, translated to Thai, but little response. Asking a Thai colleague that has the same car as you might be an approach - but if he lives on the opposite side of the city, maybe not. Surprisingly, even many Thais with out-of-warranty cars go to the dealer for repairs and pay through the nose, ordering new parts that aren't necessary.

Looking for a repair shop that specialises in your make and model is a challenge. Google and google maps can help - but still hit and miss. If you have a Benz there are plenty of specialty shops. If you have a Toyota/Honda you could probaly just take it to the nearest auto repair shop. As for other models or imports - good luck.

Owners of the Mazda CX-5 2.2L xdl diesels should always have their rig serviced at the dealer, that way when the pressure of the water pump blows the head gasket and destroys the engine they’ll put a new engine in even after the warranty has expired.