I don't know about the D4 but my dad filled up his Hyundai I30 diesel with Petrol and it wouldn't start the next day. They drained the tank and cleaned it out and there were no issues at all and nowhere near $1000.00. It did 30,000 km over several years after that and there was no permanent damage at all.
I started filling up two weekends ago on a trip with BP Ultimate. From force of habit with my BP garage at home that has a diesel only bowser with Ultimate Diesel I just thought it was diesel and started to fill up before closely checking it and finding it said petrol on the handle, not diesel. Luckily I only put in 2 l out of 65 l and it made no difference to anything. I kept topping up the tank with my long range tank every couple of km to dilute it as quickly as possible on the 200 km trip and didn't suffer any ill effects, thank goodness.
The miss fueling device has been removed on mine because of the long range tank. Maybe your friend's is the same. I've had my car since 2012 so it is not only a newbie thing!
				
			 
			
		 
			
				
			
			
				Bob
2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
2019 Discovery 5 SD6 SE, 20 inch wheels, 275/55R20 Nitto Grappler G2 tyres
			
			
		 
	
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