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      04-21-2012, 07:02 PM   #58
Lieutenant General
dopper99's Avatar

Drives: C63 S Coupe
Join Date: Jun 2011
Location: UK

iTrader: (1)

When I've tried Millers Sport 4 in the diesels I've owned over the years I've found it made no difference whatsoever and a complete waste of money.

Unlike BP Ultimate. I put 60 in yesterday and to be honest it actually feels livelier with fresh diesel just after filling up, straight out of the garage. I've heard that diesel sitting in your tank for a while it loses its cetane level (and likewise octane for petrol). Its only a slight difference but noticable therefore these days I no longer fill up with a complete full tank and have it sat in the tank for 2 weeks.