Technical Transmission Flush Question

[bmaxima02]

Hey guys. I went to my mechanic over this weekend to flush my transmission on my 02 MAX. Now I purchased 15 quarts Matic D which is the recommended type. When I got there, he told me I need 18 Quarts instead of 15. Why? Because he told me that his machine, whicH is SNAP-ON MFX HD35 does not use American Quart measurement. I called the dealer and they told me If an Flushing, I only need 12 Quarts and If am draining, I only need 5 Quarts. Is my mechanic saying the TRUTH?

[MinisterofDOOM]

I'm not sure about the quart measurement...sounds a bit iffy to me.
However, for a proper "flush", more fluid than just total fill capacity is required. The point of a flush is to fully exchange ALL fluid in the transmission. In order to achieve this, you must have a fresh supply of fluid to move through the system until it is "clean" (or, at least, until you reach some very close approximation of clean).

[loystock]

Hey guys. I went to my mechanic over this weekend to flush my transmission on my 02 MAX. Now I purchased 15 quarts Matic D which is the recommended type. When I got there, he told me I need 18 Quarts instead of 15. Why? Because he told me that his machine, whicH is SNAP-ON MFX HD35 does not use American Quart measurement. I called the dealer and they told me If an Flushing, I only need 12 Quarts and If am draining, I only need 5 Quarts. Is my mechanic saying the TRUTH?

The fluid capacity of your transmission (RE404FB) is 9 US quarts. At 50% flush allowance, 15 quarts should be enough. I have 97 & 99 I30s (RE404FA) and both of them have 10 quarts capacity. I used to bring 15 quarts to the shop for flush until I started doing the fluid replacement on my own.

The flush machine measures the amount being drained and provides a matching fluid replacement. Before the actual transmission flush, make sure the engine/transmission is warm and that the flush chemical has circulated in the transmission for at least 15 minutes. Try to look for another shop that has BG flush machine.