Originally Posted by s2k_335i
I been using royal purple since 10K and now it about 55k+. The dealer has no issue when they changed my oil.
Yep, but it'll be a different story if you have a lubrication related issue. At that point you'll be required to prove that you used approved fluids for all work.
Feel free to use dishwater mixed with sawdust in your engine. Just don't come back here and whine when your warranty claim is denied.
Then ask yourself why you were so stupid as to not use LL-01 oil while you were under warranty.