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Need for transmission and differential oil changes on 2004 Lexus RX330

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Lexus reccommends those oil changes at 25,000 and 50,000 miles. Is that something that you would suggest doing because it is necessary ? I am at 56,000 now and have not done it yet .
(1) Answer
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The RX300 transmission and differential are very reliable. I would suggest draining the transmission oil removing the transmission oil pan to replace the filter every 30,000 miles if I planned to keep your Lexus indefinitely. Draining the rear differential and replacing the oil is also necessary on All Wheel Drive vehicles at 30,000 miles again if you plan on keeping the vehicle (not applicable to two wheel drive as the differential is integral with the transmission on two wheel drives).