Purchased in December w/ 220k miles in great shape,but have no history on vehicle. Runs great started in cold minnesota winter no problem had it serviced everything is fine or seems to be,does shift hard what could this be? Also anybody with any tips or advice or know of good mechanic in Twin Cities I would REALLY appreciate as I hope to keep the car for awhile, she's beautiful no rust or dents with everything working but cruise control. Any tips from former or current 300TD owners really appreciated. What oil should I use? Thankyou.