http://www.blancpain-gt-series.com/
Thoroughly enjoyed this last year. Lots of great fights. Endurance races mixed with sprint races, absolutely stunning cars. The grid for Monza last year had over 60 entrants! This is a golden era for GT racing.
They have McLaren, BMW, Lamborghini, Mercedes, Aston Martin, Nissan, Ferrari, Bentley, Porche, Audi (Boooo ), and Chevrolet and Ford- although not seen them this year and only noticed them a few times last year.
Their youtube site is usually pretty good. They usually have the complete reruns the day after the race which the other youtube motorsport channels should take a look at.
https://www.youtube.com/user/gt1world