6000 mil tran pan fluid change is addviced.2-2.5gt,20-25% of total in tranny.dealer put dexII in my sc400.tran fluid is now mixed. shifts like sh#t now.1000 mil pan fluid changes[2-2.5gt] with filter change,fixed it.not my idea,slow fliud refresh with T IV fluid.loved tran can see 300,000.