well in terms of different oil being better,I can say this,a number of years ago my dad came across a business opportunity for an oil additive which was from a guy in europe or somewhere overseas,anyway they had a presentation which was complete with a little tiny lathe loking thing in a velvet lined wooden box,and basically they would start the thing up and proceed to have a metal bar swing over and make contact with a rotating metal arm,however before the contact would occur they would put a drop or two of different oils on the metal bar.Ok so when they would use cheapie oil the lathe would run for about a minute and all of the sudden there would be a little puff of smoke and then the thing would basically seize up,then they would demonstrate using castrol gtx which would go for about 4 minutes,then mobil1 syn,which would go for about 6 mins,and then their oil additive which would run indefinetly.castrol was by far the best dyno oil for the demo.at the time there werent many synthetic oils on the market.they also claimed that they could fill a cars crankcase with their additive,and then drain it,then start the car and it would run for over 45 mins before the motor would blow.Im not really sure what ever became of the additive,I remember they were having meetings with UPS to use the additive in their national fleet.