I've got about 500 miles since I changed the oil in my Accord. I'm one to let the engine idle for 2 to 5 minuites on a cold start. If the engine is warm then I don't bother. What I have noticed is the engine takes a little bit longer for the temp gauge to move since installed the synthetic oil. Has anyone experienced this when they switched to synthetic? I'm not looking to get flamed for idiling my car, I've been doing it for years and it allows me to make sure I have everything before I leave my driveway(phone, coffee, etc.) Thanks in advance, Steve.