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> Assuming $30 an oil change, you're looking at $12k in oil changes

If you change the oil every 5000 miles as suggested by Toyota, 350K miles is 70 oil changes, or $2100 not $12000.

You could go longer if you did periodic oil analysis plus put on a new filter (and top up the remainder) between changes. Could probably double the figure to 10k, depending on engine age.

Oh, my bad, I did the math wrong for the oil changes.

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