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Message: [QUOTE="08Monster, post: 1520187, member: 12224"] Do you know why the ash count is lower in oil? Do you know why crank cases have less acid than before? It's not the oil, it's the fuel. ULSD, ultra low sulfur diesel, was introduced with a record low sulfur content. Every engine has blowby, when the blowby occurs and meets with the water vapor in the crank case, that forms sulfuric acid. They used to add a bunch of ash to oil, because the ash neutralized the sulfuric acid. Well, every engine burns oil. You can reburn ash, so the ash would get "burned" with the oil and go into the exhaust, plugging the ***. The fuel has less sulfur, which produces less sulfuric acid, so the oil has less ash to combat the acid, so the ***s get plugged up less. So really, it's the oil manufacturers trailing the fuel industry, their oil is tweaked to work with the fuel more so than the truck. It has nothing to do with synthetics vs natural, they both have added ash, they both meet the same qualifications, synthetic is less affected by temp, and that's the biggest difference. Besides that, they do the same thing, have most of the same additives, etc. Sent from my Moto Z (2) using Tapatalk [/QUOTE]

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