What I find puzzling is why Volvo don't approve the use of fuel additives such as Redex or others. Some Premium fuels are meant to have cleaning agents in them and as a result does Volvo advise not to use such premium fuels? Its not about getting more BHP but more the case of cleaning the file line and injectors in my case. So what I have been doing is twice a year, I've filled up with a tank of Ultimate or similar. I have no idea if it does any good, I guess only time will tell.
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