Originally Posted by kschachn
This I think is a deep dark secret on Bitog. In fact, has there ever been any definitive evidence that the use of one appropriately rated oil has any statistical difference over another? We have endless posts on here that this oil or that one produced 5 ppm less iron or what-not than another with zero proof that it was even due to the oil in the first place. Many factors will influence the results on a used oil analysis, none are run in controlled environments, and yet people here hang their hats on the notion that the observed deviance is due to the oil.
In fact, what evidence we do have is that it is not due to the oil. I'd wager that the vast majority of the UOA on here are entirely worthless for this purpose yet people hang on every number as if they can glean relevance from noise.
Originally Posted by littlehulkster
You want to know the truth?
As long as it meets the manufacturer's specs, oil is oil. Especially with German cars that have more specific requirements than your standard API stuff. As long as it's on the list you're good to go.
If you buy the cheapest oil that meets specs, it will perform so close to the most expensive that the difference, even over hundreds of thousands of miles, will be imperceptible if it even exists.
So is LM overrated? Yeah. It's not alone in that, though. The fact is, oil is very much a mature industry, every company knows how to make a product that will work, and every automaker knows what products are necessary for their applications. Furthermore, no manufacturer would warrant the use of an oil if they weren't sure it would work. Just buy whatever meets specs and don't worry about it. LM works alright but it's not magic.
Nobody has ever shown any meaningful data that for the average person with an average car with average driving habits that there is any difference in the oil you use if it meets the specs/approvals of the manufacturer. Most people ditch their cars so soon and don't "drive them forever" it's hard to really say what makes an impact in terms of oil type, OCI, UOAs, etc.. It's like twin data - you need 2 identical cars from "birth" to do this kind of testing on. The oil debates etc. are just a way to be a car nerd and that's ok too.