I have been using Red Line for some time now, I had a DLE 60 sieze up about a year ago, It was under warranty so I returned it for repair, the service tech asked me what oil I was using and I told him Amsoil, he stated that the majority of the engines returned because of seizure problems were using Amsoil, he said he recommended Red Line, since I have been using it I have had to more overheating issues.
Joe I know some people swear by Amsoil, but I am sold on Red Line