Does anyone use BG44K in their X351? It was highly recommended in several threads for the X350.

 

I ran a can after hearing about it on my 2014 XJR. Noticed no difference and probably won't use it again.
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Top Tier gasoline contains additives that should make BG44K unnecessary (except for certain dealers who promote its use since it's a high profit item). If you're engine is running rough because one or more fuel injection nozzles is blocked, BG44K might be able to clean that injector.

No gas tank additives can clean the valve stems on direct injection engines.

 

Lots of discussion on this topic over on the F-Type forum, in relation to the AJ133SC (same engine as in the X351) and the AJ126 (V6), and the general view is that BG44K does work to clean fuel injectors, fuel lines and the combustion chambers. Not a lot mind you but enough to help prevent the injectors from clogging up.
Much of the discussion is about the PEA concentration in fuel additives as PEA (polyetheramine) has been proven to be the most effective cleaning ingredient.
BG44K doesn't appear to contain any PEA and they don't make any claims that it does, but some other additives/cleaners do contain reasonable amounts.
After a fair bit of research I determined that Redline SI-1 Complete Fuel System Cleaner has the highest percentage of PEA.
So for the last year or so I have been adding BK44K and Redline to the fuel tank alternating between the two around every fifth or sixth tankful of fuel.
The engine runs strong with zero symptoms of clogged injectors (it's now done around 43k miles) and without pulling the injectors and examining them I have no proof that either or both of these additives actually do anything but I'm happy to keep using them as I consider it to be relatively low cost preventative maintenance.
Edit - forgot to add - many JLR dealerships add a can of BG44K when performing a routine service but as Stuart S says it could be no more than an added bit of profit.

 

I've used BG44K for many years now when my idle starts to get a little ruff I add a can when I fuel up and after the one tank my idle smooths out. BG44K uses naphtha as the main cleaning additive to break down the deposits.

 

I tend to use Seafoam. A few ounces every 3rd or 4th tank, for the last 10 years or so, in all my cars and motorcycles. Helps with the ethanol fuel and have had no issues up to now.

 

OzXFR interesting comment on PEA. I had never heard of it but my current project is a 2014 Ford F-150 pickup. Dead common truck and has a well know fuel gauge problem. Well you can drop the tank and change the fuel pump which contains the fuel level sensor for around $400 or so. Plus the utter joy of dropping a 26 gallon fuel tank!

Or you can run some fuel system cleaners high in PEA. Seems the problem is over time Sulfur from the fuel deposit's on the electrical wiper causing it read wrong and jump around. Apparently PEA will remove these Sulfur deposits. My gas gauge went from over 3/4 of a tank to under a quarter in about 10 miles and I thought at first I might have a giant hole in the gas tank!! The recommended cleaner is a Chevron Techron product BUT they make a whole range of cleaners all with the Techron name. You want the one with the highest PEA concentration which is the "Chevron Techron Concentrate Plus Fuel System Cleaner". I have no idea how you find out the PEA concentration level either?

I generally don't have much faith in magic juice but I will say after adding 2 20oz bottles to my 26 gallon tank. All problems with the gas gauge have gone away! This is about twice the concentration recommended but the truck seems to run fine otherwise. I am pretty impressed so far! In fact I ordered an extra couple of bottles since it was way cheaper to buy a 6 pack of them and tossed one in the Jag.
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I’m about. Half tank through my first bottle of that Techron product. Idle did seem to smooth out a bit. But could be all in my head. Anyway, not that much to invest for a car with 85K. Plan on running two tanks of it then every 3-6 months. Getting a new fuel filter and plugs installed tomorrow. I want to make sure the juice is flowing nicely before I throw in a pulley and tune

 

I find simply running a different brand gas every few months helps clean out the fuel system. If you are religious about using the same brand (top tier) fuel over and over, you are doing a fairly good cleaning job of your fuel system. But, like with anything, it doesn't do 100% of the job. By switching things up, you are getting a different detergent package which will clean up different stuff. Sure, 90something percent is the same stuff, but there is that little bit that isn't. In my case, I tend to use a local company called Wawa. But, then on trips or whatnot, I will switch over to either Shell or Sunoco. I can see a slight gain in the mileage on that next tank. Kinda like you need to watch what you buy in the auto parts store. If you fill up routinely with Chevron and then add in a bottle of Techron fuel treatment, you are simply adding in the same thing that is already in your gas. You would be better off going to say STP or some other brand name cleaner. Get that different detergent mix.

 

Ditto. Chevron/Texaco (Techron), Exxon/Mobil (Synergy Supreme+) & Shell (V-Power) are only the brands I use.

 

I'm a ATV / Motorcycle / SXS mechanic, 35 + years, learned a lot, my deal is, Mix, in a one qt bottle.... half fresh gas, then mixture of seafoam, marvel Mystery oil, and RED transmission oil. give it a good shake and put in the gas tank..
I do this to all full services on my job, and every few months to my Chevy truck since new (now 95K miles) and runs like new..... the RED transmission oil is absolutely amazing on piston rings and valves.... and yes, it DOES work.
It also gives the fuel pump and injectors a good clean, as for the intake on some vehicles (spray GM Top end cleaner in there and use a tooth brush to rid that carbon and run the engine afterwards...... so much I could say, but I'll leave that for another day.

 

Just a note CptChaos? Your car does NOT have fuel filter! At least not one you can change without replacing the in-tank low pressure fuel pump.
I know I can't really explain why either?
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Yeah, it’s strange. The repair bill referred to it as a fuel filter but it’s the overall pump C2D25076.

 

Redline and BG44k DO WORK!!!!

Have had great luck with both fixing minor misfires, idle issues, exhaust smells, etc.

Now if your car isn't suffering any of the said symptoms, one might think that they are useless. If you do have an issue however, you will notice the difference.

I know use a bottle of Redline Fuel system cleaner or BG44k one bottle on the last full tank before an oil change. I do my oil changes every 5000 miles.

Best of Luck to All