I just had a conversation with a customer about the "lifetime transmission fluid" in their Toyota. They have about 40,000 miles on their Prius and the ATF is black and burnt. The transmissions of today are fairly complex inside, and hybrid vehicles typically have high voltage electric motors in them. The goal of fluid maintenance is to keep the quality of the lubricating oil/fluid as clean and debris free as possible.
Most vehicles now DO NOT have a serviceable f... read more