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      12-04-2012, 08:44 PM   #3

Drives: '08 E90 335i
Join Date: Jan 2012
Location: Northern NJ

Posts: 2,396
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2008 BMW 335i  [3.75]
Depending on strong of concentration & how often you run Leaded Race Gas, it will wear down your o2 sensors faster than if you used Unleaded Gas (Pump or Race). If you're just running Stage 1, I'd only put a few gallons in to make sure I had no timing corrections. Otherwise you're just wasting money.