I took my 6.0 truck into ford recently to have coolant flushed and filled , the next day I changed oil and noticed the coolant wasnt gold? well promtly I went back and asked why.The service guy said they added vc8 additive which is blue and turned coolant green ? my invoice says on the parts used (3)vc7b anti freeze ,(1)10068 gold cool, (2)vc8 additive. Any of you in the know, does this sound right? Maybe Im just being paranoid but second opinions are good.