bought an '07 RX350 with 140K miles. What is the best choice for oil changes - full synthetic,synthetic blend or is conventional ok?
Some people say that using synthetic oil in a high mile car that has been maintained with conventional oil can lead to problems. I am not sure that is true but a blend should be just fine. I would change the oil every 3-4,000 miles and use a quality oil filter, no orange Fram filters.
5W-30 synthetic blend is a nice compromise and I think the factory fill.
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