Quote:
Originally Posted by 335diesel
"Posh" fuels get used a lot less so often degrade more. With super unleaded, you're often getting a lower octane rating than normal petrol. I imagine it's similar with diesel.
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I've bought a bad batch of Super and diesel and found this too.
Nowadays I only buy Shell Fuelsave diesel as it is typically 55-58 cetane (according to shell) and fresh. My 535d runs as well on Fuelsave as it does on BP Ultimate, but perhaps the BP Ultimate round where I live is old and stale as it's by far the most expensive and least available fuel. I find Fuelsave to be as good as Supermarket fuel plus Millers too and as Shell can be found for the same price near a supermarket I don't bother with Millers any more.