I put winter in quotes because it isn't much of a winter compared to the rest of the country. I have a '96 Mazda Miata with a 1.8L DOHC and I've been using 10W-30 Mobil 1 SS ever since I purchased the car. It has 130,000 miles on it now, I got it with 124,000 miles. I have no idea what was in the crankcase when I got it, but I immediately changed to M1 and a SuperTech filter. I waited 2,000 miles (a kind of simple "flush" in my eyes) and changed out the M1 and then used a Wix filter. Strangely enough, the Wix called for in this engine is the same as my VG33E 3.3L V-6 in a '97 Nissan Pathfinder, 51356. I lost no oil between changes. The oil has been in for 4,495 miles now, and I got some HLA noise on cold startup yesterday morning. It was 40F, so I attributed it to the oil thickness when cold. I bought some 5W-30 M1 SS to do a oil change, and I checked the oil before draining the old oil. I had lost half a quart and the oil had turned black. This concerned me, but then again I have a '77 T-Bird that does the same thing. When it is ready for a change, the oil will darken and it'll start consuming oil. I was going to try 5000 mile intervals with this car (as with my Pathfinder) but it seems it doesn't like that idea. The only change in driving habits was a 500-mile round trip to Houston over Thanksgiving. I have a 120-mile round trip commute each day. Would a 5W-30 be recommended for winter in Texas, the coldest we've gotten so far is 26F overnight. The manual states that 10W-30 is good all the way down to 0F. Anybody have experience with this engine and change intervals? It is the same 1.8L used in the Protege. I know I should do a UOA, but I don't see that happening too soon.