No oil pressure with remote filters

Re what hoses to use, my 1985 M-B 300D (diesel) has an oil cooler beside the radiator. I re-hosed with AC Barrier hose (-12, recall). Has lasted fine for 10 years and other owners have used the same. I used a MasterCool ferrule crimper. AC hose is designed for higher pressure than oil pressure and for hot oil. Newer "barrier" type has an inner liner (Viton?) for no leakage and longer life. The hose is after a 3 ft run of steel tube, so slightly lower temperature than at the oil filter housing.