Millers DieselPower Plus contains a cetane improver which gives a better burn so improves power and economy; a lubricity enhancer which helps to ensure the high pressure pump remains properly lubricated; and a detergent to help keep the fuel system and in particular the injector nozzles clean. There is some sense in all of this. More at www.millersoils.co.uk which also now has an oil check facility enabling you to find the correct oil spec for your engine.
HJ
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As a constant user of VW snake oil (part no. G 001 700 03) in all of my cars, I know it works. As if more evidence were needed, I gave a bottle to a friend with an under-used BMW 635csi and only yesterday did he report a remarkable immediate improvement in starting and smoothness of running: it is counteracting the nasty effects of his using the car for little more than six-mile trips to the railway station and back. That's exactly what I experienced originally with my Audi 100, which was also clogging up because of short-trip usage: for instance, starting changed to one feather-touch of the key and never deteriorated.
Sadly, the price of the stuff has rocketed by over 50% in the past few years, but it's still worth it at about £6.00, which gives you enough to add to 150 litres of petrol. VW/Audi dealers are woefully ignorant of it (several of them tried for years to cure my Audi's cool-running problems without thinking of using it) and probably won't have it in stock, so call them in advance if you want to buy some.
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Most of those fuel additives I have seen look suspiciously similar to auto transmission fluid which my uncle (a factory-trained diesel mechanic for the past 35 years) would happily pour into the fuel tanks of his fuel-injected cars. Diesel or petrol, it didn't matter as my petrol engined car got a good doseage despite my nervous objections. He claimed it lubricated the injectors. Whether it did or didn't, I have no clue, but the car never suffered for it.
I suppose I shouldn't be surprised by his actions as his brother (my father) would occasionally pour a trickle of water into the carburettor of an engine at fast tickover..to "steam clean the valves and combustion chamber" you see.
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I have always followed H.J`s. advice and used quality fuel, (Shell Optimax Diesel), which I assumed included the necessary detergents and fuel pump lubricants.
Is H.J. now saying that Millers additive is now required with a quality fuel or just to supplement the inferior supermarket grades ????
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Doesn't the 'detergent' wash away the 'lubricity improver'?
And the cetane booster makes it feel like you're getting something for your money in terms of extra performance.
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