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Old 09-17-2014, 05:04 PM   #79
ab_mach1
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Join Date: Apr 2012
Location: Indianapolis/Brownsburg, IN
Posts: 2,148
Re: Important Information About Mobile 1 Synthetic Motor Oil For Mach 1's

I ran 5w-30 for the summer last year and have since switched back to 5w-20. I feel like I've done the right thing. Really though, I was only worried about the track visits and going up to redline in the heat of the summer. I've always used full synthetic, so I feel okay about switching back.
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