ZF Gearbox Oil Cooler 0501008286. OEM-grade ZF gearbox oil cooler. Fits Volvo B7R/B9L/B12 buses, Mercedes-Benz Citaro O530, IVECO coaches, and Scania K-series buses. Stainless steel construct... Request a Quote for Europe — send your OE number, quantity and destination country for a trade price.