Hi I have the same engine rattle on start up from cold,not all the time though,sometimes its ok for several days before it rattles,but yesterday it was stood in hot sunshine for about four hours when i came to start it it rattled more aggressive like never before so i decided to investigate on this site,i contacted lexus dealer but he said it was not covered due to been 07 year mileage is 42,000, he just fobbed me off so i asked for price for parts to do my self and they came to at least £1000.00.i think it is not right for us british to loose out against the americans.i will have to do a bit more investigating
regards
dave