You are right about the parts. We talk about the quality of the parts fitted under warranty. WHAT PARTS are we talking about
For the 1st 20,000 miles it will probably only want an oil and filter, by the time it wants plugs, air filter, discs and pads it will be out of warranty at 30,000 or 3 years anyway, so then fit what you want
I don't have a problem with fitting dealer parts when it is still covered under warranty, as you say virtually no difference in service item prices, my customers are more keen to pay £40:00 an hour and know the job is done properly instead of £75:00 at the dealer