Greetings: In November, we purchased a beautiful 1-owner 2010 Lexus RX350 AWD from a Lexus dealer with a full service history. Everything was done by the book along with 5K oil changes. The car currently has 95K miles. All service from day 1 was performed by the same dealer, and it does not appear that the U660F "sealed" transmission has been serviced based on the history. Lexus says that the "WS" transmission fluid is "lifetime" but as many here would agree, I think that potentially becomes "lifetime of the transmission" fluid. After reading posts on multiple forums, I am planning to do some drain and fills (probably 3x) with Idemitsu TLS-LV fluid (their Toyota OEM approved WS-specific fluid) following the temperature-specific level check procedure at the end. My question is - should I drop the pan, clean the magnets and replace the filter - or leave the filter alone? Opinions seem to be all over the place on this topic and I wanted to see if anyone with U660 transmission experience has an opinion on this. One comment on this is that this transmission has a felt-type filter as opposed to the metal screen found on older Asian-Warner units. One concern is that there is no dipstick so if the transmission pan develops a leak/seepage after I replace the filter/gasket, topping it off isn't an easy procedure (the pan is currently dry). Thanks for any thoughts on whether to replace the filter or just do drain/fills. Andrew S.