oil change for "new" bikes

[compmoto]

my KTM owner's manual, said I needed to let my dealer perform the first oil service on my bike. I did this , and didn't realize, that Motorex oil is 22.95 per container(quarts?) and was $150. for the service! including OEM filter. WOW! OTHERWISE the factory warranty is void...? ! ?! man o man, KTM is looking out for their dealers.... I normally use Amsoil products, and the oil is approx. $8. /qt. retail price... is Motorex really that good? AND where is it manufactured? Amsoil is : American Made Synthetic Oil, hence the name. Input here would be greatly appreciated. Oil always seems to cause a stir of emotion, especially since it's so important.... I know about "flat-rate" pricing for the aforementioned oil service, dealer has to profit as well. But since the dealer has specified MOTOREX oil, I'm a bit peeved. Oil is NOT ,just OIL. I'll deal with oil changes , my way, from here out... my bikes , don't blow up from oil issues.... thanx for the good products, Amsoil...