Mixing synthetic with standard engine oil
I am using Chevron Delo 400 15-40 motor oil in my ISX Cummins engine. I just had my rod and main bearings replaced because of metal in my oil sample and wanted to go with a synthetic blend 10-30 but my shop put the 15-40 back in. When I need to add oil can I add the 10-30 or the full synthetic Chevron to make it a synthetic blend? I have an Amsoil bypass filtration system and don't anticipate a total oil change for a good while.
I do enjoy your radio program and have gotten many good tips with both mechanical and business issues. I replaced my vibration dampner and added the crank shaft balancer from Pittsburgh Power and this Cummins has never run so smooth!
Is this a good question?