Just turned over 8.9 hours on my new Lazer 27 HP liquid cooled Kaw. and changed the oil and filter today, as recommended after first 8 hours. I used Mobil 1 10w30 to refill and haven't mowed with it yet but seemed to notice some discussion on not using syn type oils until well broken in........... Would really appreciate professional guidance here, as I don't want to do something which could result in damage to my engine. Mobil 1 is highly visible on all Exmark products. Guidance? Suggestions?