Hi Kari and RX in NC,
I also have an RX-300, but like RX in NC, mine is a 2000. At 77,000 miles, my rear main seal began leaking. I had it replaced yesterday. Same part number RX in NC posted (90080-31053).
Thank you both for your posts. Because of them, I knew to ask for the redesigned seal and some goodwill warranty help. My dealer was willing to to offer me a goodwill split (i.e. saved me half). Now if I can just get Lexus to pay for the other half, I'll be whole. :)
By the way, some of the other posters here have reported early transmission problems. Wouldn't hurt to ask the service folks to inspect the transmission while replacing the rear main seal.
Good luck,
-David
