I am planning to do a major service on my '76 300D. Has anyone had any experience with the engine flush solvents in diesels? Also, what transmission fluid, power steering fluid, etc should I be using. This is my first experience with the older diesels. I am planning on flushing the power steering fluid, coolant, brake fluid and engine. The engine has an unknown number of miles as the speedometer cable has been disconnected by the previous owner, (family member) for the past two years. It currently shows 245,000. Any suggestions would be helpful.