There was a big thread in the Tesla forums. Seemed to last the longest compared to a very wide range of products. They really tout their Boeing and other aerospace contracts. I bought a bottle, seems to be nice but I'm no expert.
2014 Mercedes GLK350 3.5L DFI
2014 Mercedes E350 Coupe 3.5L DFI
2007 Suzuki Grand Vitara 2.7L V6