Every Dealership has two sides to their business, fixed and variables, Fixed are service/parts...variables are Vehicle sales...
So, if you consider the closing rates, lets say (I'm making this number up) for every 6 people who walk into the showroom one may buy a Car, so it might be 6:1 right? Plus then, that guy can negotiate on the Car which means less profit for the Dealership, then there are warranties to sell, accessories, floor mats etc..BUT the point is, Car sales are variables....
On the other Paw, for every one customer who goes in for a service he is a paying customer at a fixed rate, same with Parts....so the closing ratio is 1:1
Sooooo, Dealerships rely on Parts and service to stay in business....That's why Service is so expensive, imagine how much it cost to build/equip and run Newport Lexus??!! The ground alone must have cost HUNDREDS of Dollars ;-)
Google the Moss Magnuson act and you'll see that Manufacturers and dealerships can't insist you use their parts or force you to use the Dealership for Oil changes etc, so in other words, you don't HAVE to have a "Lexus" Oil Filter to keep your Car in warranty...any way, read up, it's worth it...
It's always good to find an Independent shop if your Car is out of warranty...STAY AWAY from Jiffy Lube by the way...