I have two diesels (OM602 & OM617) that have recently decided to begin leaking oil out of the head gaskets. Since I have two wengines to repair, I don't hve the funds to do the job. Thus, I am considering an attempt at a DIY on one. If I do one, why not do both (right?). Are there any online resources to help with this? Also, is this an entirely foolish attempt that will probably require my mechanic to rescue me from myself?