The old Redex bottle had the following instructions – 100ml of Redex per 50L of fuel as a one-off to get you started (for the first 300 miles), then 50ml per 50L with every thankful.
The new Redex bottle says only 125ml per 50L every thankful but no mentioning of a one-off treatment.
I actually called them up (call me an anorak), and their spokesman said that these are two different products – the new Redex replacing the old one, and that’s why the instructions are different. I put it to him that the ‘new’ Redex was simply diluted compared to the old product as you now need 125ml per 50L instead of 50ml! But he wouldn’t comment on that, all he said was again that these are two different products…
As for Shell Optimax / V-Power BP Ultimate etc, he said he could not comment on other manufacturer’s products, but half-agreed with me that if the super-fuels already contained detergents, and if they were similar to the ones Redex use, then there would be little point in adding Redex to super-fuels – though he did stress that Redex was compatible with the super-fuels (hmmm… makes you think… how can he know that if he says he didn’t know what the oil companies were using in their super-fuels…?) and that it will do no harm if used with super-fuels (i.e. in having too much detergents in the system).
So in short… I used to add 50ml of the old product and then 125ml of the new product with every thankful (I usually fill the tank when it is not completely empty so I get in around 50L), but now that I am using BP Ultimate I only add Redex every fourth thankful – it is probably not needed at all with the super-fuel, but I am old-fashioned and can’t easily kick a decade-old habit…
As for other high-octane fuels, the situation is not that clear. Shell and BP advertise their super-fuels as having detergents, which is the crucial factor here (not the octane itself). If the other super-fuels also have detergents as do Shell’s and BP’s super-fuels, then same rule applies i.e. you probably don’t really need to use Redex with them , but if they are only high-octane fuels and containing no detergents then Redex (or similar product) would be in order.
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Topic: does the cat like redex?? (Read 1793 times)