Switch to Full Synthetic Oil

I do it all the time with my race engines. I break them in with conventional oil then switch to 5w-30 or 5w-20 Amsoil synthetic. I did it with my 2004 diesel, going from conventional 15w-40 Rotella to HD 15w-40 Amsoil and currently have Series 3000 5w-30 Amsoil in it. I will do the same in my 2005 Dakota which had an oil change when I bought it last summer. Synthetic Amsoil going into it also. Never had a problem. (I've had some minor rear seal issues over the years with both conventional and synthetics.)

There are several Amsoil synthetics that still have high concentrations of zinc, including some of their their diesel and Dominator race oils. There are some others but I can't find the info at the moment.

When there are leaks after a change, it's usually from old gaskets that have started to lose plyability and may have had gunk accumulations over time which got cleaned out by the new synthetics. Synthetics can find marginal seals and leak a bit easier.

Amsoil source and info: www.thelubepage.com