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<blockquote data-quote="Taylorman55" data-source="post: 202830" data-attributes="member: 1290">Have you seen the pour tests with Amsoil, Royal Purple, Mobil 1 synthetics? When it gets cold like ND cold, Royal purple would be the last one I'd use. Mobil 1 absolutely walked away from the above mentioned. Royal purple also doesn't like high heat very well either. One of power plants in Mercer county switched from Mobil 1 to Royal purple and went running back to Mobil 1 within a few months due to a wide variety of issues. Just food for thought. Its a good oil, but if you are looking for something top notch, the purple jug is not it. Now, if a guy is starting their vehicles in a heated shop or garage all winter, then to each their own. With my chemistry background it not only furthered my thoughts on Royal purple, and the more I dug into it, and the tests I ran myself. For vehicles I run nothing but Mobil 1 synthetic, even in my 6.7 diesel. (5w-40). On my older work car that has a leak or two, I run Havoline. For the love of god, anyone reading this, do not use Penzoil or Quaker state, you are asking for sludge infested motor after some miles.</blockquote>

[QUOTE="Taylorman55, post: 202830, member: 1290"] Have you seen the pour tests with Amsoil, Royal Purple, Mobil 1 synthetics? When it gets cold like ND cold, Royal purple would be the last one I'd use. Mobil 1 absolutely walked away from the above mentioned. Royal purple also doesn't like high heat very well either. One of power plants in Mercer county switched from Mobil 1 to Royal purple and went running back to Mobil 1 within a few months due to a wide variety of issues. Just food for thought. Its a good oil, but if you are looking for something top notch, the purple jug is not it. Now, if a guy is starting their vehicles in a heated shop or garage all winter, then to each their own. With my chemistry background it not only furthered my thoughts on Royal purple, and the more I dug into it, and the tests I ran myself. For vehicles I run nothing but Mobil 1 synthetic, even in my 6.7 diesel. (5w-40). On my older work car that has a leak or two, I run Havoline. For the love of god, anyone reading this, do not use Penzoil or Quaker state, you are asking for sludge infested motor after some miles. [/QUOTE]

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