For the 2020 model 330 Meiyan version, should I use the 0-20 oil from the 4S shop or buy other oil myself for better performance?

For a 2017 Honda City with 90,000 kilometers, what type of engine oil should be used? Should it be 20 or 30?

For the BYD Song PULS fuel version, if you're not going to the 4S shop for maintenance, what type of engine oil and transmission fluid should be used?

Are there no more 4S shops now, so should I go directly to a repair shop for maintenance?

Which brand is better for changing the transmission oil of the 2020 Haval H6?

Haval H2's snow mode malfunctioned. Should I go to the 4S shop for repair?

Should I replace the battery at the 4S shop or do it myself? I'm torn.

This car has been abandoned by the manufacturer, and Dongfeng Fengxing is about to go bankrupt. What should everyone do if they can't find a 4S shop? Do you usually get maintenance at the 4S shop?

Is it better to buy Cayenne brake pads online or go to the 4S shop?

Does anyone know how to maintain the transmission for the Pentium 8AT version? I've been asking the 4S shop for a long time, and they keep saying it's out of stock. Can I get it serviced at an external transmission repair shop? Just using gravity oil change, can other maintenance kits be sourced at external repair shops?

Has anyone encountered cracked door handles on a 20-year-old Cayenne? The 4S shop refuses to repair them under warranty because it's expired. What should I do?