Of course it was a business decision. Everything is a business decision. What else would it be? A donation? Or because it's marketing no testing was done? LOLNo one is questioning that Mobil1 meets the needs of GM and is a good oil, but so is Pennzoil and other mainstream oil brands. Do you think GM tested Pennzoil and Mobil1, and winner was Mobil1 purely on technicality and not any business decisions?
Shell and XOM are worldclass formulators that work with OEMs on lubricants.