Owners Manual
Page 502
... are equipped with a timing chain, which requires no periodic inspection.) Tire Rotation While driving the vehicle, check for deterioration, Periodic fluid checks and replacement of leakage, damage and loose electrical connections. Timing Belt (except GS 300 and IS) Replace every 90,000 miles or 108 months. Refer to the instructions in Lexus service and repair...
... are equipped with a timing chain, which requires no periodic inspection.) Tire Rotation While driving the vehicle, check for deterioration, Periodic fluid checks and replacement of leakage, damage and loose electrical connections. Timing Belt (except GS 300 and IS) Replace every 90,000 miles or 108 months. Refer to the instructions in Lexus service and repair...