Used to read a lot about this on the Land Rover forums when I was active there.
I think essentially it can suppress some symptoms of an engine ageing (noisy injectors etc.) but it is just that - symptomatic relief.
Given how much manufacturers stress about using low ash lubricating oils in the engine, adding it to the diesel tank doesn't seem to be a good idea though you would think the amount added is so small it shouldn't matter.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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