In Malaysia, the cost of replacing the transmission fluid for the 2018 Honda Odyssey generally ranges from RM300 to RM600. The specific price depends on the type of repair centre (such as an authorised Honda service centre or a third - party repair shop), the brand of transmission fluid used (the original Honda ATF DW - 1 or products of equivalent specifications), and whether additional services are included (such as replacing the oil filter or conducting a system check). On the other hand, third - party repair shops may offer more competitive prices. It is generally recommended to replace the transmission fluid every 40,000 to 60,000 kilometres or every 2 to 3 years. Regular replacement can protect the internal parts of the transmission and avoid problems such as rough shifting or wear caused by fluid deterioration. If your Odyssey is equipped with a Honda Earth Dreams technology transmission, make sure to use the specified fluid to ensure optimal performance. It is also advisable to check the transmission oil pan and seals for signs of leakage when replacing the fluid. This kind of preventive maintenance can extend the lifespan of the transmission and avoid higher repair costs.