Lexus GS 350 Owner's Manual page 444

NOTE:
1. Replace both the engine oil and oil filter, even when the maintenance reminder
does not appear, after 12 months have passed, or when driven over 15000 km
(9000 miles) since the last oil change. This may cause the maintenance reminder
appear even when driven less than 15000 km (9000 miles).
Replace both engine oil and oil filter every 7500 km (4500 miles) or 6 months, in
which the vehicle is mainly driven in dirt or dusty roads, when the maintenance
reminder does not appear.
2. First replace at 160000 km (100000 miles), then replace every 80000 km
(50000 miles)
3. GS300: Including the intercooler coolant.
4. It is possible to replace every 100000 km (60000 miles).
5. Including the filter in fuel tank.
6. Parking brake inspection is not necessary.
GS350_300_GS F_OM_OM30J17E_(GE)
443
6-2. Maintenance
6