I've been using only Mobil 1 and Wix filters in my e39 since I bought it. It had 117,000 mi. then and it now has 290,000 mi. I have been changing it as the dash indicator turns red, which is 12k to 15k mi. Many will tell me I'm crazy for doing so but my method has been working fine for me. I fully believe in Mobil 1 and Wix filters.
I discovered I scream the same way whether I'm about to be eaten by a great white shark or if a piece of seaweed touches my foot.