1) The banjo bolt isn't the easiest to get to, but if you take off your UP, you can reach up from underneath and access it a lot easier. It sits between the turbo and the 2/4 cylinder head. Good idea to do this while you have the axle out to replace it (just replace the whole axle - don't mess with trying to "fix" the CV). Will give you even more room to work.
2) Reconsider using Mobil 1. Boosted EJs eats this stuff for lunch. My master tech in San Diego mentioned in conversation that almost every engine that he's had to rebuild was run on Mobil 1. Many have had great success with Shell's Rotella T6. I personally run mine for 135K on Valvoline 5W-30 conventional oil... and the banjor bolt filter is still in there.
So many mods, so little time