BG sells a lot of extra things that are not needed at all. Your best bet is go with what ever brand name full synthetic oil you like ie: Mobil 1, Royal Purple, Castrol, Shell, or any of the million others. By running the full synthetic you get the best viscosity and most durable oil out there. The full synth stand up better to heat and leaves less residue while still extending drain intervals to where you want to be. If you feel like that is still not enough buy an engine oil supplement w/ a friction modifier and detergent package. There is no need to run a PTFE/teflon additive package this will probably do more harm then good, PTFE is more of a marketing supplement than anything. PTFE oil supplements were created to help a customer that has oil leaking issues with their engine but not willing to spend more than $10-$15 to try and fix it. It is also designed as a long term treatment which if you have had the vehicle since 0 miles and take care of it with full synth oil you should never need.
If you are still set on the "BG" supplements you can go to their website and search for a authorized dealer in your area, be advised that BG spends a lot of money on their marketing and advertising so you are going to over pay. You can find oil supplements much more affordable that are actually identical formulations.