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SVTPerformance's Chain of Restaurants
The Greasy Spoon
My first oil change on 14 track pack GT.. Cap says 5w/50
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<blockquote data-quote="UnleashedBeast" data-source="post: 14520891" data-attributes="member: 112023"><p>The only 5W-50 lubricant in the world to carry WSS-M2C931-B specification is Motorcraft 5W-50. Castrol dropped this specification about two years ago. For the short term, it will not damage your cats. Long term, phosphorus ppm content in the lubricant can destroy them. I honestly wouldn't lose any sleep over this, as API SL certification hasn't been gone that long really. The only reason why the API adopted SM and SN certifications (lower ZDDP) was to pacify auto manufactures desire to make the catalyst survive beyond the federal regulated warranty of 80,000 miles. </p><p></p><p>Is it my lubricant of choice for your car, no. Will it be fine in your engine, sure....on the road course. Not my choice for street only action, as it's far too viscous, and you live in a cold environment. I'd opt for a true synthetic 10W-30 from Amsoil for your car for street use. 5W-50 lubricants on paper, above 32*F, actually spec like a 20W-50. True synthetic 10W-30 will have far better cold start ups.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 14520891, member: 112023"] The only 5W-50 lubricant in the world to carry WSS-M2C931-B specification is Motorcraft 5W-50. Castrol dropped this specification about two years ago. For the short term, it will not damage your cats. Long term, phosphorus ppm content in the lubricant can destroy them. I honestly wouldn't lose any sleep over this, as API SL certification hasn't been gone that long really. The only reason why the API adopted SM and SN certifications (lower ZDDP) was to pacify auto manufactures desire to make the catalyst survive beyond the federal regulated warranty of 80,000 miles. Is it my lubricant of choice for your car, no. Will it be fine in your engine, sure....on the road course. Not my choice for street only action, as it's far too viscous, and you live in a cold environment. I'd opt for a true synthetic 10W-30 from Amsoil for your car for street use. 5W-50 lubricants on paper, above 32*F, actually spec like a 20W-50. True synthetic 10W-30 will have far better cold start ups. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Greasy Spoon
My first oil change on 14 track pack GT.. Cap says 5w/50
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