I have used BG transmission service (with my Amsoil fluid) and coolant service with great success.
A couple of weeks ago, I had to replace the oil pressure sending unit on my Titan. Much to my chagrin, I did not realize that so much oil would come out when I removed the sensor.
Long story short, I wound up having to do a complete oil change that I was not prepared for. I had my filter, but was not stocked on PU. Didn't feel like going to Walmart so I went to Oreilly and got 7qts of M1 5w30 cause it was on sale.
Had a valve tick with the M1 that I don't get with the PU. Got myself a can of the BG MOA and I swear the tick stopped immediately. Much quieter engine with the MOA and M1.
I'll send a UOA when I change this time to see if there is anything special.
I will say that I like the BG products much more than I like the shops pushing a warranty. I buy products based on performance, not warranty.
2005 Nissan Titan 280k
Pennzoil Ultra 5w30
Royal Purple Oil Filter
Amsoil 75w140 diff oil
2007 Volvo XC90 V8 AWD 140k
Mobil 1 0w40
Mobil 3309 ATF