98 ssei tranny questions

Ok so i just bought a 98 ssei and love it, upon inspection of this car i knoticed the tranny fluid to be terribly dark!!!! I almost didnt even take the car for a test drive after knoticing this but i did and i couldnt believe how smooth it shifted.Anyways i bought the car and it truly drives like new i have been told that flushing the tranny could be bad for it so should i just change the fluid and filter?? By the way i was planning on running lucas in the motor and tranny as i have in my gtp, any opinions on that?? This tranny has a whopping 198,000 miles on it and still shifts smooooooth!!! performance shift works works flawlessly,all good. thanks for any input!!!

Drop the pan, replace the filter and fluid to Dex 6... Don't flush it at this point..

How dark is dark? Brown or Black?

The fluid is brown its not terrible just not bright red like my gtp's but with 198k on it i suppose the discoloration isnt too bad,also i ran a diagnostic on it and it said running lean on left bank any ideas on common problems with that??? by the way had no prob spankin the hemi durango in traffic today,lol,,, thanks for the input

You must be looking at Bank 1 sensor 1...? If so this is the sensor in the rear manifold.. Check and make sure your fuel pressure and MAF are within spec, as well look at the swing from the O2 and the crosscurrents..

For the trans simply do that Fluid and filter change, should help the trans live longer..:)