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Originally Posted by Deviant
My brother-in-law works for Shell and told me about this awhile back. Their new Penzoil Platinum is derived from Natural Gas so it's purer than any synthetic can get close to being. Ferrari switched a bit ago and now BMW. It's supposedly the biggest breakthrough in oil since synthetic.
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Admittedly I am an audio engineer and not a petro-chemical engineer, but I never heard of purity being a factor in comparing engine oils. Wouldn't purity go out the window soon after you started using it? My understanding was synthetic oil's main advantage was temperature stability.