Drain and fill, or flush?
A drain and fill replaces roughly a third to a half of the fluid and is the conservative option. A full flush exchanges nearly all of it. On a high-mileage transmission that has never been serviced, many technicians — us included — prefer the gentler drain and fill. There is genuine debate about flushing neglected units, and we will explain our reasoning rather than just selling the bigger job.
Slipping, flaring, or harsh shifts
These are not fluid-service symptoms. If the transmission is slipping under load or shifting harshly, fresh fluid will not repair worn clutches, and anyone who tells you otherwise is selling you something. We will diagnose the cause before recommending anything.
Using the right fluid matters
Modern transmissions specify fluid by exact manufacturer standard, and the wrong fluid can cause shudder or damage. This is not a place for universal one-size-fits-all product.