Is it mandatory to have maintenance at a 4S shop during the warranty period?

[VincentDella]

During the warranty period, it is not mandatory to have maintenance done at a 4S shop, but it must be performed at a qualified repair shop. Otherwise, if quality issues arise later, the 4S shop will not cover the warranty. Repairs can still be done, but fees will apply. Additional information: 1. If maintenance is done at a qualified repair shop: (1) There are many counterfeit and substandard engine oils, oil filters, and various car parts on the market, so it is essential to choose a qualified repair shop for maintenance. (2) Sufficient evidence must be provided to prove that during external maintenance, the problematic parts or related components were not tampered with. The evidence provided must be legal and valid. 2. If the engine malfunctions: Without maintenance at a 4S shop, it is difficult to accurately determine whether the fault is due to a quality issue with the vehicle itself or the use of inappropriate parts by the customer.