The most important part is to not drive hard before the oil temp has warmed up. Cool down is important too, but only if you've been driving very hard.... Remember, turbos are a wear item. You're only slowing the wear down by taking care of them.
I wet though 2 turbos on my old B5 A4 and am on my second set in the 335. If I keep the 335 long enough I would bet that it will get another set.
Jet black e92 6mt 335xi:
18" BBS RGRs, KW v1, ESS Stage 2 flash, VRSF 7" FMIC, VRSF downpipes, JG Mods m-tech front, mtec V3 AEs, BMS OCC, hardwired valentine 1, p3cars gauge, amber delete, sport seats, factory oil cooler.