Drain and Fill every 15k always works well for my driving habits. City cars that do alot of stop and go will burn transmission fluid quick at 10k. A good indication how a car is driven is front brake pad wear and rotor color/condition.

 

Many vehicle manufacturers don't require or even suggest trans fluid changes until 100k or more... no need to do it at 15k... fluids have come a long way...

it's not as easy on newer cars to just drain and fill, you need a scan tool and special equipment on many newer cars with sealed transmissions....

 

question... i have a 97 Sc400 204K :/ duno if the trans fluid has been changed.. having some down shifting problems.. does it here and there.. been told if i change the fluid i'm gonna start more problems or start slippage.. some people say use some lucas... what should i do??

 

My recommendation is not to do a POWER flush. This is when new ATF is pushed through the transmission at pressure. Rather, do several drain and fills over a few months, or go someplace that uses a T-Tec (sp?) machine that basically replaces all the fluid in the trans using the transmission's own pressure.

Skip the Lucas and get some high mileage ATF and change it all out.

No ATF lasts 100k miles. Those lifetime ATF's (MB from my own experience) do not last and they needed to be changed out by 50k. I've always changed ATF atleast by the 30k mark.

 

well im planning on getting a new transmission or a rebuild kit for it now.. don't wanna risk anything.. i duno what the up keep was on the car before i bought it.. .i want this car to make it a while since this my second choice dream car.. first was my T/A 2002.. rip so now im working on this.. wanna super charge it so might be better to just get a new tranny...