CVT Transmission Fluid Change: Gravity Drain or Flush Method?

[DeKatherine]

Both the flush method and gravity drain for CVT transmission fluid have their pros and cons. Detailed analysis is as follows: 1. Gravity drain is a manual fluid change method that involves loosening the drain plug at the bottom of the transmission or removing the transmission pan to allow the fluid to flow out naturally. Under normal circumstances, this method can only drain about 70% of the fluid, resulting in incomplete replacement (potential residual contaminants and metal particles) that may contaminate the new fluid. However, this method poses no risk of transmission issues. 2. The flush method uses specialized equipment. A transmission flush machine operates by creating pressure to dynamically replace automatic transmission fluid, working on the principle of simultaneously extracting old fluid while injecting new fluid. The pressure helps push out the old fluid with the new one, achieving a replacement rate of over 95%. This method is thorough, labor-saving, and can appropriately extend the transmission fluid maintenance interval, but it comes with higher costs.