Purchased a quart off of eBay and received a quart of XPF Pro instead. Seller says they are discontinuing the XPF XR and only making one oil, the XPF Pro. Anyone know anything about this? I know the oils are supposed to be compatible but I have ran the XR since day one without any problems. Aside from that it is a highly rated oil by many sources. I have ran into problems with automobile engines when changing oils. I am afraid the seals will start leaking if I change now. The engine is a 2004 90 V4 (purchased new in spring of 06). Any comments appreciated. Thanks.