I went down a rabbit hole on engine wear and cold starts.

TL;DR

  1. Wait ~10–30 seconds after startup to unsure oil gets fully circulated. (The Idle RPM’s should be settled) Don’t idle longer to warm up, instead.
  2. Drive gently (light throttle & load), avoiding hard acceleration until the temperature gauge starts to rise.
  • long idling: ~10–15 min to warm up = WORSE wear.
  • Gentle driving: ~2–5 min to warm up = Less ware.

Key facts

  1. Most engine wear happens at startup (during cold starts), not cruising.
  • Studies show startup wear is significantly higher than normal operation, as the oil hasn’t fully circulated yet. (metal-on-metal contact is higher)

  1. Piston rings & cylinder bore wear are a major wear point, and one of the main end of lifespan driver

  2. Gentle driving until the temperature gauge starts to rise driving is the best warm-up method. Light load/gentle driving means faster heating of: oil, piston rings, cylinder walls. All getting engine out of high-wear “cold phase” faster

  3. Increased engine load = Increased engine ware.

❌ What to avoid

  • Idling 5–15 minutes to “warm up”. (longer dwell in cold, higher ware state)
  • Heavy load (towing, hard acceleration, high revving) immediately after startup. (With a cold engine)
  • Short trips.
  • Cold climates or weather.

✅ What to embrace

  • Long trips.
  • Engine block & oil pan heater.
  • Hot climates or a heated garage.
  • Leave running but locked at short stops.

What about the Transmission?

Yes, warming up your transmission is important. No, idling isn’t the way to do it. Gentle driving is again the best practice!

Sources & Additional reading:

https://www.youtube.com/watch?v=e3AdUj8FZAs
https://www.youtube.com/watch?v=AQ_Gt0yPlO0&t=1773s
https://www.youtube.com/watch?v=F2RXxrPT_CA
https://www.qualityusedautomotive.com/news/124/2026-03-07-idling-cold-engines-to-warm-up-actually-damages-piston-rings/
https://www.reddit.com/r/tdi/comments/1hykq8n/cold_engine_idling_vs_driving_off_scientific/
https://www.reddit.com/r/mazda/comments/1pj70tl/is_it_really_that_bad_to_let_your_car_idle_to/ ___