No more stress than driving on the street. Run sessions are short enough that I don't run into any heat issues on the Castrol track (unlike Calgary's Race City Speedway, with its half-mile straight at full throttle).
If you're worried, run the 128i as opposed to the 335i.
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Richard
2013 BMW M3 Individual -- Fire Orange (sold)
2013 BMW X1 xDrive35i M-Sport -- Valencia Orange (sold)
2011 BMW 1-series M Coupe (#205/220) -- Valencia Orange (sold)
2009 BMW 135i M-Sport Coupe -- Space Grey (sold)
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