Don't think anyone knowledgeable would make the decision to use Mobil 1 with blinders on. Have an oil analysis or 2 (before & after) done, then decide if it's worth paying that much especially when you may not even benefit from it.

Off Roader
98 Montero with the Winter Package
89 Montero minty clean and reserved for overlanding trips or Cars and Coffee events
96SR (3.15:1 xcase, 35's) gone to the rust gods
96SR Build Up Thread
Old web page
Old web page