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Here is the list and recommendation for the spark plug replacement that list in the Owner's Manual and Repair Manual for Lexus models and years. ES300: 1990-1998 60,000 miles 1999 90,000 miles 2000 to date 120,000 miles IS300: 2001 to date 120,000 miles RX300: 1999 to date 90,000 miles SC400/430 1992-1998 60,000 miles 1999 90,000 miles 2000 to date 120,000 miles GS300/SC300 1993-2000 60,000 miles 2001 to date 120,000 miles GS400/430 1998 60,000 miles 1999 90,000 miles 2000 to date 120,000 miles LS400/430 1990-1998 60,000 miles 1999 90,000 miles 2000 to date 120,000 miles LX470 1998 60,000 miles 1999 90,000 miles 2000 to date 120,000 miles LX450 1996-1997 30,000 miles I hope this will help some of you to make the decision on your services. We have a lot of discussion about this issue before and how the Lexus dealer charge you for certain services. This is just a guide line that Lexus recommended in the owner's manual, not madatory or anything.