Just joined no idea if this will help or what engine is in a disco !
I know how strange this sounds but read on and giggle.
Met a fellow whilst filling up my last car ( Saab convertible TID ) at a bp station who was putting an additive into his tank. When I asked him what it was as I’d tried most of Halfords best he advised he was an engineer working at a tech college. He’d researched all the products on the market and found this one to be the best.
He was putting it into a BMW 320d. He said you put in one millilitre for each litre of diesel and it completely cleans the engine, DPF/ CAT, turbo, injectors the works.
I’m literally just about to ask the zone if anyone has used this product on a Land Rover?
It’s called Archoil available on Amazon.
Supplied by “ power enhancer “ I know I laughed too.
May be worth a look at it the reviews I’ve read seem pretty good though nothing on landies