I have a 25 year old car which will be undergoing some bodywork at a leisurely pace. It's unlikely to be driven for several months, perhaps as long as a year. What's the best oil to have in it during storage? This is a cast iron block/aluminum head Volvo B21 "red block" engine. Am I correct in thinking that the diesel formulations like Chevron Delo, Shell Rotella or Mobil Delvac would be best?