How many liters of oil should be added to a Fast 12-speed transmission?
3 Answers
Fast 12-speed transmission requires 12 liters of oil. The following is an introduction about Fast: 1. Introduction: Fast, the full name is Shaanxi Fast Auto Drive Group Company Limited, which was restructured from Shaanxi Automobile Gear Factory. It is a large-scale specialized production base mainly manufacturing heavy-duty vehicle transmissions, transfer cases, power take-offs, and various automotive gears and their forgings and castings. 2. Main products: The group company's main products include: dual countershaft series transmissions produced with American technology and various series transmissions independently developed and produced; series power take-offs and transfer cases matching the above products; OEM gear parts for export and various domestic and imported automotive gear forgings and auto parts.
The recommended oil capacity for the Fast 12-speed transmission is generally around 15 liters, but it depends on your specific vehicle model and actual conditions. Based on my long-term driving experience, insufficient oil in manual transmissions like this increases gear friction, spikes fuel consumption, and may even damage components. For standard models like the RT-11509C, factory manuals typically specify 14-16 liters. During oil changes, first check if old oil is fully drained via the drain port, and use GL-4 grade gear oil—never compromise quality for cheaper alternatives. Change intervals should ideally be annual or every 30,000 km, with more frequent changes needed for vehicles regularly operating on long-distance mountain routes. After refilling, warm up the engine for 10 minutes to check for abnormal noises and ensure smooth operation. While being 1-2 liters short may not cause immediate issues, prolonged underfilling accelerates wear, so always prepare sufficient oil beforehand—safety first.
I used to help friends with car repairs often, and the transmission fluid level is quite crucial. For the Fast 12-speed transmission, it typically requires 15 to 16 liters. Don't underestimate this fluid—it plays a vital role in lubrication and heat dissipation. Structurally, the double countershaft design ensures smooth operation only when fully submerged in oil; overfilling can cause leaks and dirty the engine bay. I recommend using a dedicated dipstick to check the oil level, ensuring it's in the middle of the scale. Choosing the right viscosity is also essential, such as 80W-90 gear oil, which works well in both summer and winter. Before adding, park the car on level ground and let it run for a while to fully drain the old oil. If you're unsure about the model, check Fast's official website or app—enter the serial number for instant answers. A slight shortage of a liter or half might not show immediate issues, but overheating and clutch damage during high-speed driving can be serious. Regular maintenance saves hassle in the long run.
