the fastest lap for an American OEM on the Nordschleife has now been set by the Ford GT Mk IV, and it set a lap at 6:15.977 (thank you Dale! ) So, the only competition, is what, a Corvette? Cadillac doesn't have a factory race car anymore, do they?

So, yes, unlimited funding and engineering expertise can make a winner. Ford proved that in 65 with the GT 40s beating all competition at Le Mans. 

But, does it really mean anything useful? So, Ford can build a race car... what, that's supposed to be news? or some accomplishment? 

A track-only vehicle classified in the prototype category — is the fastest car currently available for purchase, to lap Nürburgring . 

It's cheaper to buy a race car that can get around it faster, that's something I'm pretty sure of...

Ford has a production schedule for 67 of these, I'm guessing 2/3rds of them are going to be investment only purchases, never taken to a track, and flipped in less than 5 years. 

https://www.fromtheroad.ford.com/us/en/articles/2026/ford-gt-mk-iv-nurburgring-record