It depends on the oil. Regular mineral FEO, I'd change at 5000km. But if it is Mobil1, then 7500km is fine. It should reach 10,000km as well unless it is a turbo'd set up where the oil also cools and lubricates the hot turbo.
The best place to get aluminium crush washers in bulk is either ebay from overseas or a bulk bolt place like Nepean boltmaster (make sure you measure the inner/outer diameters and the thickness).




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