no fighting because of what i do !!!
i use AMSOIL Series 3000 100% Synthetic Heavy Duty Diesel Oil, changing at a 15k mile interval with filter changes every 5k......awesome stuff !! have been using it for almost 10 years in my Benz diesels......one has 326k now , the other has 283k....
every fluid in my Benz's is from AMSOIL, thus they are petroleum free cars, even the fuel... take that OPEC !!!
i use their products in all my other power equipment, toys, boat etc as well......as the company that developed the first synthetic motor oil, as well as being continued leaders in the lubrication industry, they make awesome stuff !!