993 Turbo maintenance discipline — the canonical ownership playbook

Six items recur as essential for 993 Turbo stewardship: (1) install oil check valves / p-trap to prevent oil seepage into turbos during idle (eliminates startup smoke — Rothsport is the common source); (2) cool-down sub-3000 rpm for the last half-mile/mile after spirited driving; (3) replace the plastic accordion oil-return line on the passenger side that runs through the body panel — it cracks and seeps into the passenger floorboard; (4) use OEM dual filters (there are two) and 20W-50 or 10W-60 oil in warm climates; (5) raise the rear lid after driving to dissipate engine-bay heat; (6) address the wiring-harness recall if not done.