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Lancorp,
I've used the Amsoil 0w-30 2000 series in my 97 Q45. I changed the oil myself for a couple of years until my wife started to bitch at me about it. It's actually 30K oil change for the 2000 series isn't it?
Anyways, you have to keep in mind that you have the follow thing to deal with 1) change oil filter every 6 month. 2) You have one year maximum on the oil. This is actually Amsoils recommendation. I didn't like spending the extra money on the 2000 series because I had to get under my car to change oil filter every six months. I figure, while I'm down there, I might as well change the oil. So that point kind-of sucks for me. The other point is that I really didn't notice a difference in mileage.
I originally sought out the Amsoil because of the poor mileage in the Q45. If you ask me what I would do is to use a top quality Synthetic oil (Mobil, Royal Purple, Redline) and a top quality filter that can be supplied and serviced by a quick lube place or other service facility. I'm changing the oil every 5K - 7K miles in my 300C. Heck, I'll have a replacement for my 300C in about 4 years anyways.
There is a link in this thread to a web site where these guys did a very methodically analysis on oil life and it will surprise you. The study shows that anything less than 7K on Synthetic oil is really not necessary.
That's my 2 cents.
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