The East-west 300 fleet suffered continuing problems with oil fumes, sourced from both the engines and the APU, they were evident within 9 months of the types introduction into the fleet . So it would appear as though the fume problem is spread across all 146 variants. I believe the Fokker 100 and G IV used the same 150 series APU as the 146-300 and they too suffered from some fume ingestion problems.