I've got an 85 300TD, our workhorse. 269 on the clock, runs well, but does have some blue smoke. And shs's very cranky when cold (don't know if it's injectors or a lazy cylinder). In any event, you guys with the high milegae diesels, are you using any engine additives (not techron or redline fuel additives)for better/longer life? Any thoughts appreciated, thanks in advance. allen.