Quote:
Originally Posted by 10/10ths
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One nice thing about the DT40, which you should change every 3,000, by the way, is that you can hear when you need to change the oil. When the oil is fresh and clean, the lifters and cam chain tensioners are quiet on cold start. When you hit 4,000 miles on the oil, you will hear "Click & Clack, the Tappet Brothers" while they pump up.
That's a friendly reminder to change the oil.
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DT40: Better living through chemistry! 
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I don't think that is a good selling point, losing it's lubricating effectiveness after only 3-5k miles