You must be visiting the wrong online enthusiasts forums. The one I frequently visit for my tow vehicle is routinely visited by independent mechanics who've specialized in that vehicle for decades and sometimes know it almost as well as the factory engineers. And they routinely offer expert advice with a knowledge base that often exceeds that of sometimes younger dealer mechanics. Yes, there's novice, sometimes bad advice in such forums, but there's also wisdom from 20 year master mechanics who specialize in that marque. You just have to sort through that.