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For a quality synthetic, I would suggest that 7500 miles is tops, esp given the Boxes engine woes.
That is my opinion based on used oil analysis I have seen over the years.
Could you go longer? Sure. Question might be why?
IMHO.
PS-I change the oil in my Lexus every 5K and I live in SOCAL. I use Penzoil platinum synthetic.
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Rich Belloff
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