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I use Synthetic oil because it lasts longer before it gets too dark to please me.
For a while I didn't mind changing dino oil every 2500 miles. When I was changing oil every 6 weeks I got fed up with it. Since then I have been experimenting with different synths and filters to find an economical and long lasting motor oil setup.
I like doing oil twice a year rather than 5 times a year.
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