You mean the owners won't see any benefit. ALL cars will benefit from lower frictional losses which can effectively gain a HP or two. Smaller molecules are better fitting into engines that have tight tolerances. Premium vehicles come from the factory with full synthetic oil for a reason. In the last few years GM ships the Corvette with full synthetic oil in all engines. Before then, they didn't so they could save on costs (imagine that).Most cars won't see any benefit out of using synthethic motor oil. Using the ultra is a total waste of money unless you constantly drive at extreme conditions.
I run synthetic oil in my personal vehicles, as well as my work fleet and small engines. Saves me about $1500 a year between labour and fluid costs. Never had any mechanical problems in 11 years.
The owners however, will knowingly abide by their on board computer on when to change the oil. The oil change monitor doesn't take into account synthetic or non synthetic oil. It merely throws the same parameters together, such as speed, acceleration, engine rpm and time, together to make its calculations. Nothing actually 'tests' the oil for viscosity break down. If oil is good for say 15K miles, even driving the vehicle like you stole it, you'll get 13-14K out of that oil before it starts to break down. If you drive 150 miles a day all highway, you can go over the 15K mile service life easily with oil analysis. The oil change monitor might tell you to change it at 7K or 8K miles. It's inaccurate.
I'm currently running a couple tests, my G6 GT is one of the mules. This July, will be the SECOND year on the same oil and same oil filter (both Amsoil). For those that don't know, Amsoil offers a one year warranty. However, as I don't drive this car much, after a year I sent half an ounce of oil away for analysis and it came back with 72% life remaining. So, I left it in for another year and I'll do another analysis this July and knowingly change it out as it saw some highway trips this past year. The 5W30 is rated for 25K miles. As of last week, I have 15K miles on it - after two years. When I change the oil this July, I'll inspect the filter carefully and post up the oil analysis results after TWO years of use. :band: