I recently purchased an '85 300D turbo and truly enjoy it and am now beginning the process of bringing it to my maintenance standard. My question is what should I watch for or need to address. The car has 153K miles and is very clean. The trans does shift quite hard, but I hear that is common for the model. Other than that, I just need info on which oil to use, when to do maintenance, etc. Also, what is the best maintenance manual for these vehicles? Thank you for your replies.