hypertech question
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hypertech question
2003 f350 with a 5.4... commenced to installing the high octane tune on my truck with the milage around 60000 and was blown away by the performance increase, but because of the rising fuel costs i changed it back to stock at around 90000. I have noticed slight pinging and valve noise since then with 87, if i fill it with 89 it seems to run ok. I would also like to add that I have also recently switched my oil to synthetic ( if that has anything to do with it).
Could anyone explain to me why this is so, or any suggestions?
Could anyone explain to me why this is so, or any suggestions?
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mstiles19
6.0L Power Stroke Diesel
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Dec 2, 2012 10:45 AM
