Reddit mentions of Royal Purple Max-Clean Fuel System Cleaner and Stabilizer 11722

Hopefully you change your oil earlier than normal, regardless of synthetic. I change my turbo oils at 40-50% life, these cars are abused.

Darker new oil is somehwat expected after the change, when you drain the oil there is still old oil in passages and crevices.

My anecdote on insta-black new oil is that it's more common on turbo cars; anyone else?

Royal Purple 11722 Max-Clean Fuel System Cleaner and Stabilizer - 20 oz. https://www.amazon.com/dp/B00B1VBQRS/ref=cm_sw_r_other_apa_OWCsybS22VA6T

I would recommend going by what the owner manuel says to do at 75k miles. As far as the Thermostat and Gasket, I would remove those from the list as those are typically on the maintenance list of things to do, however, it wouldn't hurt to have them inspected. As far as the air and cabin filter, those you can do on your own, just look up a couple of Youtube videos, it'll take you all but ten minutes, save you money. As far as the complete fuel, I presume you mean by a fuel line clean. I would start now, and every 10k miles, just add Royal Purple Fuel Cleaner, this will help clean out the fuel lines and I've always found it to work better than seafoam (I started this at 30k miles). When you add it, do it after an oil change and when your tank is near empty. Coolant, transmission flush, drive belt, I would get done. Clamps, have them inspected, and have the Upper and Lower Radiator Hose Inspected, they are designed to last at least 100k miles.

Finally, I wouldn't take it to the Kia dealership, I would have the mechanic to above said things, it'll be easier on the wallet :)