For an occasional weekend driver, once a year is fine. But it all comes down to vehicle use. For those occasional weekends, are you doing anything more than a spirited drive? (IE autocross, HPDE, etc?)
I only put 5,000-6,000 miles on my M, but tend to do two oil changes a year simply because this car is used for a lot of autocrosses and now will be used for HPDE as well. May be overkill, but an oil change isn't expensive (I also use LiquiMoly 10W60, ends up being about $55ish each time).
Don't forget to also periodically change the other fluids (brake, trans, diff, coolant) in your car as well!
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2017 M2 - Camber Hubs, MPE, and some other goodies
2006 Z4M - Epic Tune / Eventuri CAI / Euro Headers / Stromung / FA 500 / AS SSK / Arc 8s
2004 Z4 3.0i - Gone, but not forgotten!
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