I've tried searching here but can't find answer. I've recently started running T6 in all my gas engines(motorcycles and ATV also) Now I'm picking up a used well maintained 2003 Infiniti G35 gas engine with 121k miles that the single owner has been using Mobil 1 full synthetic since very first oil change. I believe it was 10w30 and we live in Southern California so don't have freezing temps. So my question can I switch to Rotella T6 without causing harm? Also some of the engines in this model car had oil burn questions but owner said his does not. I believe seller cause he is car enthusiast and has all maintenance records since buying car.