Just a heads-up, the Lotus oil filter (Toyota part #90915-10004) that originally came on the car (and that you could subsequently get from Lotus dealers) is no longer the filter Lotus sells for the Elise/Exige. The 10004 has been replaced by Toyota part # 90915-TA002 -- that's what the dealers are getting from Lotus as of now. That filter does not have the red silicone O-ring of the 0004 and looks to be of a slightly different (cheaper) design.
Also, the Toyota oil filter part # 90915-YZZA1 has been superceded and the new # is 90915-YZZF1, which has been superceded by...... you get the point. Basically, all the Toyota part #'s for their oil filters that we have been accustomed to using for reference purposes when trying to purchase a Toyota oil filter for our Elise/Exige have changed. Time to update the great info at the sandsmuseum site...
http://www.sandsmuseum.com/cars/elis...oilfilter.html 
