What is the best engine flush product for a 2014 V6 supercharged XJ?

 

Coolant? Oil? Fuel system?
What are you looking for?
And while products are specific to what system they flush, they aren't specific to a vehicle.
You'd probably do best by researching cleaning products for what ever you're looking to flush in the general forum (i.e. overall internet searches) that would give much more info.

 

Engine flush as in to clean the engine, to flush the chambers and pipes the oil flows through.

 

If you follow appropriate oil change intervals and use synthetic oil there is no need for this. Oils have detergent additives that perform this function well when changed regularly.

 

Do a search on YouTube about engine oil flushes. Lots of tests that show they are a bad idea. If you let your engine oil changes go so long that you have sludge throughout, the only hope is to disassemble the engine to clean it, or you will do more harm than good. No magic in a bottle unfortunately. If you don't have sludge buildup, just keep changing your oil with a quality oil with the exact spec for these engines (not just the weight), and change it twice as often as Jag recommends.

 

I wanted to check with the experts along with my internet searches.

 

I agree it's not really needed but if you want to give it a try I recommend BG EPR (Engine Performance Restoration).
It gets good reviews and I have used it (just the once) with zero problems.
When I first got my F-Type way back in 2016 I had no info what the previous owners had or had not done regards oil changes and servicing so one of the first things I did was an oil change and an engine flush using BG EPR. As I said no problems since, who knows if it made a positive difference but it did no harm.

 

That's my expert opinion. Don't do it. These engines have small passages with variable valve timing just like most modern engines. Knocking sludge loose in big chunks is going to do more harm than good.