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EXPERTS HAVE URGED MOTORISTS TO CHECK THE INSTRUCTIONS BEFORE ADDING ADDITIVES TO THEIR MOTORS. 08:54, 29 May 2025 A mechanic has issued an urgent warning to millions of diesel drivers as
they risk a "ruinous" engine problem. Experts have urged motorists to check the instructions before adding additives to their motors. There are 11 million diesel vehicles on the
road across the UK, and some road users may use so-called "regeneration" aids to help clear a partially blocked diesel particulate filter (DPF) if it is compromised by soot.
Experts from GEM Motoring Assist warned additives containing iron are not as effective as more expensive additives. An expert from GEM said: "Others are designed for light engine oil
blockages. READ MORE FOREIGN OFFICE ISSUES 'IMPORTANT' WARNING FOR UK TOURISTS 'WHO HAVE HEALTH CONDITION' "Read the instructions and align the product with what you
are trying to achieve. Never blend additives or double-up dosings, believing that more additives will yield superior results. Doing so could be ruinous." Classic car experts at
insurance firm Hagerty have urged drivers to contact their vehicle manufacturer or owners club to determine which additives to use. However, they have given a few tips on what owners can use
to avoid being caught out. For cars older than 1996, they recommend Castrol’s Classic Valvemaster which can help to prevent corrosion. This mix also contains an ethanol stabiliser which can
limit the effects of the new E10 fuel. For modern classics with a catalytic converter installed there are a few additives available that would do the trick Article continues below Hagerty
has recommended Millers Ethanol Protection Additive or Lucas Oil Ethanol Fuel Conditioner. The Federation of British Historic Vehicle Clubs (FBHVC) said many additives “claim complete
protection” for classic cars. However, they warned the FBHVC has not tested additives that claim complete fuel protection on the new compound. The FBHVC did warn some additives can be very
effective in reducing ethanol corrosion of the fuel tanks. One expert added most additives would only protect against corrosion from water absorbed by the fuel”.