Figured the knowledge base on the board could provide some general answers. In a diesel that has a particulate filter and does regeneration, which base oils produce the most ash and of these ashes, which will continue to burn off during regeneration. I may be falsely assuming that I and II may produce more ash but would also be more fully consumed in regeneration and that some III, IV and V may not burn at all. I guess the additive package should also be weighed. Calcium, detergents, Zinc, phosphor's, moly etc. Which base + additive package would offer the most robust protection in the 5W-30 range with a 10,000 mile OCI, but also create little ash that won't be consumed. In my case a direct injected, turbocharged diesel with a 5W-30 spec. I imagine this info could also apply to many other diesels. Edemucate me please.
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