What kinda "sale" price are we talkin about here? It might be cheaper/easier to go with a different/better kind of oil to begin with...
2007 E90 335i - Automagic - Non sport /// Cobb AP - Alpina Flash
Summer: Sonic Tuning ST100 - 18x8.5 ET35 - Conti DWS 245/40/18 - 10mm rear spacers
Winter: Style 159 - 17x8 ET34 - Michelin X-Ice Xi2 225/50/17 - 15mm rear spacers