Synthetic oils

I run the Amsoil 10w-40 specifically because it has zinc. They also clearly state that the oil is NOT capable of going 25K miles like its other oils, simply because the zinc will not last that long.

It's irrelevant anyway, because I am never going to hit their 12K mileage limit in a year.:toothy10:

One thing people need to remember about factory fill synthetics....the engines are pre-spun for break in before the oil is ever added. I ran my 360 for about 2K miles before I switched to Synthetic.