It also says do it occasionally to clean the engine. Supermarket fuels are said to lack cleaning additives though whether this is an urban myth, I’ve no idea. My BIL had to scrap a diesel A5, the garage put the injector issues down to supermarket fuel.
It might be the difference between an engine that performs adequately for 100,000 miles, as per the manufacturers spec, before needing replacement of things like fuel injectors, emissions gear, etc. and the same engine going 150k miles before needing the same. Most people don't get to 100k miles, so they wouldn't care. I would, my car's on 188k without significant attention, though the EGR valve is getting dicky. I don't have any control sample, obviously, but my car was owned from new by a friend who did 160k miles in 10 years and was religious over servicing and using fuel additive. The last MoT showed emissions below the lower detection limit, which at 170k miles I consider remarkable. Proof it's not, but it's an anecdote worth recounting.Why would any mainstream manufactured engine require after market fuel additives?
There's one of our number here who is an engine design engineer, he would know.
It might be the difference between an engine that performs adequately for 100,000 miles, as per the manufacturers spec, before needing replacement of things like fuel injectors, emissions gear, etc. and the same engine going 150k miles before needing the same. Most people don't get to 100k miles, so they wouldn't care. I would, my car's on 188k without significant attention, though the EGR valve is getting dicky. I don't have any control sample, obviously, but my car was owned from new by a friend who did 160k miles in 10 years and was religious over servicing and using fuel additive. The last MoT showed emissions below the lower detection limit, which at 170k miles I consider remarkable. Proof it's not, but it's an anecdote worth recounting.
I think Redex. I use the stuff every few tankfuls, usually what I can get on special offer, Aldi do 2x Redex for £4 or £5.Thank you - this is exactly what I poorly explained in my OP. I run a 2014 diesel, and being on a tight budget the longer the car can last for the better. What additives were used by the previous owner? Do you also use additives?
I use normal petrol and never think of additives of any sort.
When driving, I go for maximum economy.
Accelerating slowly, reading the road to anticipate and keeping my maximum speed to 55 mph
on single carriageways and 65 mph on motorways.
Do you have a Costco card? Their diesel has the premium additives as standard, and costs around 10p/litre less than most supermarket offerings.Thank you - this is exactly what I poorly explained in my OP. I run a 2014 diesel, and being on a tight budget the longer the car can last for the better. What additives were used by the previous owner? Do you also use additives?
That’s great but an Italian tune up once in a while is a good thing to do IMHO.
I use normal petrol and never think of additives of any sort.
When driving, I go for maximum economy.
Accelerating slowly, reading the road to anticipate and keeping my maximum speed to 55 mph
on single carriageways and 65 mph on motorways.
My little Skoda can do 60+ mpg easily.
I don’t think Audi drivers like me, though.
I think Redex. I use the stuff every few tankfuls, usually what I can get on special offer, Aldi do 2x Redex for £4 or £5.