I'll probably keep the Motul in for a few more weeks and then go back to GC for summer. Although it's 90 today so it already feels like summer!
It was only $6.99 a quart from Mastro, but of course you have to pay for shipping. That's the cheapest that I've seen it on-line. I got my current GC on sale for $4.50 a quart.
I'm baffled by the Silicon. I've only done two UOA's on my wife's '99 OB and it was less than 10ppm's both times with a K&N panel filter. Maybe it's because she drives to cleaner western NJ for work, and we take my car if we go to NYC or up and down the NJ Turnpike (I95).
I'll probably do a Dyson at the end of my next GC run to see what he says about the Si. I've even had my dealer make sure that my intake box isn't leaking.