Duralec Ultra combines premium base oils with Royal Purple's proprietary additive technology Synerlec to create a high-performance motor oil that optimizes engine performance and provides superior protection in rigorous on/off highway applications.
Royal Purple 80561 Duralec Ultra SAE 15W-40 Diesel Motor Oil
Royal Purple 1154 Duralec Superquart
Royal Purple 04154 Duralec Super 15W-40 Synthetic Diesel Motor Oil - 3 Gallons
Royal Purple Duralec 0W40 Case of 6 Quarts
Royal Purple Duralec Super 15W-40 Synthetic Motor Oil for Diesel Engine 5 Gallon
Royal Purple Duralec Super Diesel 5W-40 CK-4 Motor Oil - 1 Gallon - Case of 3
