Originally Posted by crash1369

The real question is Why are they saying it would cause problems, do that have any information to back up those claims or are they just repeating some rumor they heard somewhere?

I wouldn't worry about it, I've heard claims royal purple was bad but have not been able to find anything to back that up. I have seen information to support the claims of it being a quality product and talked to a few people who agree it is superior, for various reasons.