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Started by 94touring, March 01, 2021, 04:06:18 PM
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Quote from: 94touring on March 01, 2021, 09:39:36 PMAlso noteworthy with some more digging around various test pages. "ZDDPlus" added to Royal Purple 20W50, API SN, synthetic = 63,595 psizinc = 2436 ppm (up 1848 ppm)phos = 2053 ppm (up 1356 ppm)moly = 2 ppm (up 2 ppm)The psi value here is 24% LOWER than this oil had BEFORE the ZDDPlus was added to it. Oil companies always say to NEVER add anything to their oils, because adding anything will upset the carefully balanced additive package, and ruin the oil's chemical composition. And that is precisely what we see here. Adding ZDDPlus SIGNIFICANTLY REDUCED this oil's wear prevention capability. Just the opposite of what was promised. Buyer beware.ZDDPlus" added to O'Reilly (house brand) 5W30, API SN, conventional = 56,728 psizinc = 2711 ppm (up 1848 ppm)phos = 2172 ppm (up 1356 ppm)moly = 2 ppm (up 2 ppm)The psi value here is a whopping 38% LOWER than this oil had BEFORE the ZDDPlus "Edelbrock Zinc Additive" added to Lucas 5W30, API SN, conventional = 51,545 psizinc = 1565 ppm (up 573 ppm)phos = 1277 ppm (up 517 ppm)moly = 15 ppm (up 15 ppm)The psi value here is a "breath taking" 44% LOWER than this oil had BEFORE the Edelbrock Zinc
QuoteVery interesting. With the negative effects of the zinc additives it kind of makes sense why the manufacturers make no claims on what the additives actually do. The marketing is all on PPM of the zinc - not what it actually does to the oil it is added to.
Quote from: Richard1 on April 26, 2022, 05:19:06 AMI have recently added that to my paper on the selection of the right oil for our Minis (along with a few others sold for classics cars and Minis: https://www.widman.biz/mini_pics/classic-mini-oil.pdf
Quote from: 94touring on April 26, 2022, 05:35:39 AMQuote from: Richard1 on April 26, 2022, 05:19:06 AMI have recently added that to my paper on the selection of the right oil for our Minis (along with a few others sold for classics cars and Minis: https://www.widman.biz/mini_pics/classic-mini-oil.pdfI'll have to dig into that once I have a moment. Looks like a big read. I'm still using VR1 20w50 and Mobile 1 synthetic in 15w50 in my minis. My VW motors get Vr1 10w30 that require high zinc. Might toss this classic castrol on the list for when I don't want to run full synthetic in the minis.