Engine oil

[Fazerider]

Oops! Meant to stick a smiley at the end of the second line of my last post, forgot, and what was meant to be mildly humorous ended up reading like I was having a hissy fit.
I was just trying to make the point that Simon's request for examples of problems caused by car oil being responsible for bike engine failure being followed by a demand to prove it was a bit pointless. From a statistical point of view, there won't be enough data to establish a causal link even if every member of this forum contributed detailed account of every bike they owned, mileages and oil used.
A blind test with two identical bikes alternated regularly between two riders and run for say, 50,000 miles each and followed by a forensic examination would offer much more convincing evidence whether or not bike oil is just car oil with the price jacked up. "Ride" magazine used to do various long term tests, but so far as I know that isn't something they've attempted.
In the absence of scientific studies I'd tried to look at the problem from the other direction. That is, that it's obvious that the oil has a tougher environment in a bike than it does in a car. So, oil companies would hardly limit themselves to ripping off thousands of bikers on the one hand yet supply millions of car drivers with oil that is way better than it needs to be for their purposes. Therefore car and bike oils must be different.