Originally Posted by billjohnson
Anyone ever have any issues doing this with older cars/trucks? Thinking about doing this to a:
2001 Ford Focus (SPI)---108,000 miles
1999 Mercury Mountaineer 5.0 V8 (170,000 miles)
Both cars have original filters and tranny fluid...and I'm wondering if doing a change now will possibly screw up the transmissions?? Thanks for any advice!!
If ur trans fluid or filter has never been changed then you may want to just leave it alone a friend of my dad owns a shop in detroit mi and he has told many people if you change out the old oil that has all the grit in it with new oil your trans may stop shifting due to the wear between the clutchs and friction plates. Id be careful on ny car with over 150k and never had a change