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How to change the transmission oil on a Sym Symphony 151 scooter? Follow this guide to proceed with the replacement. Position the scooter on the original stand, and using a socket wrench, unscrew the drain bolt located under the casing (drain the fluid into a container). Refit the drain bolt to the casing. Unscrew the special bolt just above the drain bolt (as shown in the video). Refill the new transmission fluid using a plastic syringe (fill with the correct amount of oil); close the casing with the locking bolt. Test the scooter's operation.

Updated on 8 March 2026 by ScegliAuto

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