
Aisin is the transmission brand for the X1. Founded in 1969, Aisin is a world-renowned professional developer and manufacturer of automotive automatic transmissions. In the field of automotive automatic transmissions, Aisin's products hold the world's highest market share. The X1 uses an 8-speed automatic manual transmission, also known as an 8AT transmission. The AT transmission is a relatively common automatic transmission, with a complex structure that includes many planetary gears and clutch plates inside. The 8-speed automatic manual transmission features only five shifting components across four gear sets, with only two components engaged during each shift. Additionally, the new axial-parallel sliding vane pump improves transmission efficiency, minimizing energy loss. For the X1's transmission in daily use, the following points should be noted: Do not delay transmission fluid changes for extended periods. Although many modern vehicles feature -free transmission fluid, "maintenance-free" does not mean it never needs replacement. Prolonged failure to change the transmission fluid can damage internal components such as bearings and the housing. Avoid prolonged coasting in neutral. While driving manual transmission vehicles, many experienced drivers may coast in neutral, but for automatic transmission vehicles, this can cause overheating and create a noticeable impact when shifting back into Drive (D). Never shift into Drive (D) or Reverse (R) before the vehicle comes to a complete stop. Some drivers, aiming for "smooth" operation, shift into reverse gears before the vehicle has fully stopped, which can cause significant damage to the transmission gears and lead to gear grinding or other failures over time. Avoid frequent uphill climbs in Drive (D). On steep inclines, automatic transmission vehicles may overheat due to high load or shift prematurely, resulting in insufficient climbing power. In such cases, use manual mode to lock in lower gears or switch to sport mode to protect the transmission. Do not tow over long distances. If an automatic transmission vehicle breaks down, use a flatbed tow truck to move it onto the tow platform while in Neutral (N). Do not use tow ropes or similar methods to drag the vehicle directly.

The X1 indeed utilizes ZF transmissions in most variants, notably the renowned 8-speed automatic transmission model 8HP, celebrated for its smooth shifting and fuel efficiency. From my personal experience, ZF has provided BMW with technical support for years, and the X1's driving fluidity is partly attributed to this design. However, in certain entry-level or hybrid models like the X1 xDrive25e, BMW may switch to Aisin or other suppliers' transmissions to reduce costs. The transmission's durability is commendable, though high-mileage units require regular transmission fluid changes every 60,000-80,000 km to prevent overheating issues. Overall, consulting the maintenance manual to verify the specific transmission model is advisable when selecting an X1.

After driving several X1 models, I found most gasoline and diesel versions are equipped with ZF transmissions, delivering refined driving feel with almost no gearshift jerkiness. However, there are some variations across model years - pre-2020 versions mostly used 6-speed, while newer models upgraded to 8-speed for better fuel efficiency. ZF gearboxes are common but not exclusive in family, hybrids or base trims sometimes use other brands. As an owner, maintenance key points are timely fluid changes and avoiding aggressive driving to prolong lifespan, otherwise warning lights may appear under heavy loads.

Over years of car repair, I've encountered many X1 cases. Many indeed come with ZF automatic transmissions, especially the mainstream models. The advantage is the universal parts and convenient , but a common issue is oil circuit blockage leading to slow gear shifting. It's recommended to change the oil and inspect the filter screen every 80,000 kilometers. Model variations depend on the engine – three-cylinder engines might not have ZF transmissions. When purchasing, checking the VIN code or service records is more accurate.

The transmission evolution of the X1 is quite interesting. The first generation predominantly used ZF's 6-speed, later upgraded to an 8-speed for improved efficiency. However, in specific markets like China, locally produced models or new energy versions might mix suppliers. ZF designs are reliable but require regular oil changes to prevent early wear. Checking the vehicle configuration manual is crucial, as adjustments were made across different model years—for instance, hybrid versions may integrate Aisin units.

Before purchasing the X1, I researched that most configurations use ZF transmissions, known for their stable performance and quick shifting. However, details may vary by model, such as diesel versions or new plug-in hybrids, which might have non-pure ZF variants. focuses on regular checks of the transmission fluid to ensure timely replacement, otherwise issues like abnormal noises or sluggish shifting may arise. A simple way to confirm is to check the maintenance manual or ask the dealer for the corresponding model.


