Daffyduck528
Expert Expediter
I have a 2008 cat c13 with 725,000 miles on it. It's had nothing but Delo from day one in the engine but my driver just had the pm done and they put Delvac in it. Is this going to be a problem? Do I just run Delvac in it from now? Do I need to have it drained and get Delo back in it?