At least they owned up to it...
The second I saw them using the same procedures used by the infomercial scammers, I knew something was up.
Read through the thread. M1 is one of the best.
My best advise to you(assuming you dont drive like an old lady who shifts at 3,000 rpm), is to get your oil sampled. From my research, you're definitally doing damage.
Multi-weight oil has additives that expand when they heat up to change the rating. For example, in a 10W30, the oil is a 10 weight oil, with additives to thicken it to a 30 weight when hot. Over time, these additives burn up. I haven't done oil tests in the NSX yet, but in the Type-R, 3000 miles of spirited driving was enough to burn up enough additives so that it could only turn the 10 weight into a 20 weight when warm. This means, every time I revved to 8400rpm, I was doing so with only a 20 weight protecting my engine! I can only imagine if you ran the oil for 7,000 miles!!!
And zinc is only useful for oil starvation. It doesn't protect you when your oil breaks down from usage.
