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I have a 2014 C Max SEL Hybrid with 55,000 miles. I've had the oil changed every 5,000 miles at the dealer. This time, they told me I needed additional additives. These were supposed to clean the fuel system, treat the engine oil, restore engine performance, and install a premium ethanol defender. I finally found out it was the BG product 44K Platinum. I also think they were proposing the use of BG's EPR for hybrids. This "oil change" would cost $329. I felt they were up-selling and declined their oil change. I told them that service was not in the manual and if it was needed it would have been stated there. They said it would make my car last longer. I know these products can be bought locally and I can add them myself. What are other C Max owners doing? Are they using additives and are they needed at 55,000 miles? I might add I have not had any problems with this car and plan to drive it till the wheels fall off. I do get 40.9 MPG which indicates to me the car is performing correctly. Your opinions would be greatly appreciated.

Timing chain. And there's no service interval listed by Ford for this.