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      02-11-2010, 03:24 PM   #40
Matt2008
Private First Class
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Drives: E46 M3
Join Date: Dec 2009
Location: Cambs


Posts: 176
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Quick question... Only used BP Ultimate diesel in my car but if i wanted to try out tescos 99 octane, is it best to get my tank almost empty before trying? I usually never let my tank drop below half.
Likewise with my non BMW petrol engine which i use BP Ultimate.
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