Do you use fully synthetic or semi-synthetic oil for your 10,000 km oil change?

How do you guys change the transmission oil for your Ruixing? I changed my transmission oil at 200,000 km, and now it's almost 260,000 km. When I accelerate at low RPMs, there's a noticeable jerk and drag, like it's getting stuck.

What engine oil is recommended for the Jinxuan 4B11? I've been using the original 5W30 mineral oil from the 4S shop for over 5 years (people say it's like gutter oil [lol]). I want to switch directly to fully synthetic oil. Any recommendations? Some say you should transition with semi-synthetic oil before switching from mineral to fully synthetic. Is this necessary for the Jinxuan?

I last changed the oil in August last year and have driven less than 10,000 kilometers since then. Do I need to change the oil now, and what's a good type to use?

Can the original engine oil of the 90 Zilong Edition last for 10,000 km before needing a change? Changing it every 5,000 km seems too frequent.

Which synthetic engine oil do you use for the 2020 Tharu 1.4T model?

Do you use fully synthetic oil or semi-synthetic oil for your 308?

Which is better for fully synthetic motor oil, Castrol or Mobil?

What should I pay attention to for the second maintenance of the VS7? Any tips from experienced drivers? Do I need to use fully synthetic oil? Currently, it has run 9,200 kilometers.

Do you use fully synthetic or semi-synthetic oil for your 10,000 km oil change?

How long should I wait for the next maintenance after adding semi-synthetic oil?