Hi there, I am the guy who said a while ago that he was underwhelmed. Things seem to have changed in my car. I have noticed the following in a positive way: 1) Milage was not affected negatively, car still gets summer gas fuel efficicency despite it being winter. 2) Drove 1000+ km at 120-160 km average speeds and car did not seem to burn any oil, nor did the colour seem to darken much according to the dipstick. A number of cold starts also. 3) The engine got smoother in stop and go traffic. When I first poured it in, the car would vibrate at idle, etc. I think the ECU has now gotten used to it. Now the car idles smoother than before at stops and I don't notice the idle needle jerking around. This is good because I have an underdrive pulley, so perhaps some compensation is taking place here. I am happy about point 3, my car feels better as a result. 4) It seems easier to maintain a constant rpm without it spinning up and down as much. Negatively: 1) Car still drives like it's a brick. What I mean by this is that in stop and go traffic, it does not zoom up the rpms as fast as the Canadian Tire 100% Synth 5w30 I was using before. This means moving out from a stop is slower. Car also feels like it has more inertia or heavy mass while driving, like if I hit something it would do more damage. So I think A3 ratings are great. I would like to try a full synth A3 rated 0w20 or 5w20 just see if it is more rev happy but I don't think any exist. I need to get those revs up quicker, so I can get needed torque happening. Looking at some specs, QS 5w30 might be worth looking at, it's a A3 10.50 whereas 0w30 GC is 12 something. Both QS and Pennzoil 5w20 full synths meet the Ford spec, the Mobil 1 0w20 gets 2.61 HTHS while Pennzoil gets 2.70 which I find interesting. Of course, none of these products are yet available on the Canadian market that I can see other than the GC. I feel frustruated by this. Probably the Ford dealers don't have full synth 5w20 either. Royal Purple 5w20 MIGHT be available at a store I've not been to. Oh, something Mobil 1 is doing here now, they're now bundling their oil in 4.5 or 5 litre jugs. I don't like that, more is not always better if one uses 4 litres at a time for oil changes. So yeah. I'm ok with GC but do wish it revved faster. That's why people myself included feel it has lost the car some power. You know what I also wonder? Given that Shell makes Quaker State and Pennzoil, and the Canadian Tire stuff, if I was buying 100% Synth, does this mean I was already getting essentially QS/PZ or something different just for C.T.?