I'll probably catch grief for bumping an oil thread, but I just put in M1 0W-40 (changing from the Nissan magic oil) and a slightly larger filter: -9E000. The car has a little over 5000 miles.
Note: I'm not a Mobil fanboy. In fact, I've never put M1 in any of my vehicles. Rotella and Amsoil for the ATV and Sportbike, and good old Castrol GTX in "Maxine" for the last 140,000.
So far, I'm very impressed. I specifically remember the feel and sound after my last oil change, as it was part of a consumption test as well. (Passed it, so no new short block for me.) The Z sounds about the same, but the feel seems to be a little smoother, especially the revs from 5000-7000+.
The car seems to run about 10 or so degrees cooler as well. Even after the last change with the Nissan stuff I was still running 220 or so no matter how slowly/smoothly I drove. Any acceleration above what's needed for normal driving would drive it up to 230+ quickly. Today, the temp is 82 and sunny, humid as well, and I haven't seen anything near 220 all day. My temp now stays between 200-210 no matter how I drive the car. I took two trips to redline plus a lot of stop and go with the AC on, and the temp freezes at 210 and won't climb any higher.
I realize new oil will usually lower temperatures, but I certainly didn't see this kind of drop with the last change. I hope it lasts until my next oil change and I'll continue to put in M1. My $.02.
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