My oil boiler in coming up for a service and an online mate of mine suggested I ask my engineer to use Dualex for the service as he said it may help save on my oil consumption as my boiler is quite old is this stuff any good.
Is it worth buying and giving it to the service engineer?
http://www.dualx.co.uk/
Is it worth buying and giving it to the service engineer?
http://www.dualx.co.uk/