I had a 2003 VW 1.8T and sold it with a little over 200k miles. Based on everything I believe, I would do no longer than 5k mike OCIs using something like Castrol 0W-40, Mobil 1 0W-40, or perhaps Red Line or Amsoil or Ravenol. I would not use LC20 because it certainly detracts from some motor...