Motul Transmission Cleaner and Flush: Maximize Gearbox Performance & Longevity

Maintaining optimal performance in any transmission system starts with cleanliness. Before adding high-performance transmission fluids, it’s essential to remove old deposits, varnish, and metallic debris. Motul offers a specialized cleaner and a post-cleaning flush product to ensure a contaminant-free environment inside automatic and manual gearboxes. Ideal for professional service centers and performance vehicle shops, these products extend transmission life and improve fluid effectiveness.

Motul Trans Flush – View Product

• Type: Pre-Drain Internal Transmission Cleaner
• Application: Automatic and Manual Transmissions
• Volume: 300ml per bottle (one per vehicle recommended)

Trans Flush is added to the existing transmission fluid before draining to break down sludge, varnish, and debris inside the system. It's particularly effective for high-mileage vehicles or systems that haven't had fluid changed in a long time. Use prior to a complete drain and refill to prepare the transmission for fresh fluid.

Motul Gearbox Clean – View Product

• Type: Gearbox and Differential Cleaner
• Application: Manual Gearboxes and Differentials
• Use: Add before fluid drain; idle for 5–10 minutes

Gearbox Clean is designed to dissolve build-up in heavily loaded manual gearboxes and differentials. It's a technician's tool for ensuring clean internal surfaces before refilling with new Motul Gear 300 or Gear Competition oils. Useful for off-road, motorsport, or workhorse vehicles subject to heavy mechanical loads.

Applications

• Transmission Rebuilders: Cleaners help minimize contamination risks during rebuild or service intervals.
• Heavy-Duty Fleets: Remove buildup from overworked gearboxes in commercial trucks or towing vehicles.
• Performance Shops: Prepares drivetrains for fresh high-end synthetics in racing or high-load environments.

Recommended Pairings

• Use Trans Flush before filling with Motul ATF VI or Multi ATF.
• Pair Gearbox Clean with Gear 300 or Gear 300 LS.

More on Gear Oils

Explore Motul’s full lineup of manual transmission lubricants or read our ATF and DCTF guide for product comparisons.