The service recommendation for the timing belt on the IS200 was revised from 100k or 10 years, to 60k or 6 years, but was it revised for the IS300 too, my book just says 100,000 miles, but doesn't say if it needs doing every 6 or 10 years, I could do with a confirmation from someone in the know as even my local Toyota and Lexus dealers are unsure
My IS300 is a 2002 and i've had it just over a year, it had just under 49k when I got it in Jan '10, and I had it serviced May '10 with 50k on and Now it has 56,400, FLSH and no mention of Timing belts ever been done
altho goin thru the receipts it seem the previous owner spent a fotune lookin after it