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Rx300 Oil Change


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I know this is an age-old question with Lexus/Toyotas, but I use Castrol Syntec 10w-30 in my 99 RX300 (bought it used & that is what had been used in it previously) and have been changing the oil every 3,000 because of the sludge issue. Does this issue still exist when using synthetic motor oil? How often should I change the oil if I am using the synthetic type of oil? I almost have 70,000 on the vehicle & they are mostly highway miles. Thanks!!

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