I get it that how it feels between your fingers is far from scientific but I've been around trucks my whole life, worked for 35 years in a dealer shop.
Mobil 1, is slick to the touch, if you dip your fingers in it then try to pickup a flat screwdriver by the blade tip, its not happening, but with the Super Tech, its not a problem. Its not scientific but its also a clear sign they're different by a mile in lubricity. Don't get me wrong, I'm not saying Super Tech is bad oil, from my experience, its just not as good as Mobil 1.
I've used other synthetic oils, and Super Tech is the only one that ever gave me cause to wonder if it were really on the same playing field. In other motors, small engines and such, I've not had any issues but I have had a few motors that didn't seem to like it.
I put Super Tech 10w-30 synthetic in my Cub Cadet riding tractor with a CH15 motor, it used oil bad on it, I'd had a half pint every time I mowed. When i switched back to cheaper Dino oil, the oil consumption and leaks were gone.
Again, not bad oil, just not right for that motor. In my Briggs engines and Kohler Command twin cylinder its been fine. SIde by side, both 10w-30 weight oil, the Mobil 1 is thicker out of the bottle, not by a lot but enough to be noticeable. At below 20°F the Mobil 1 is still very viscous, the Super Tech thicknens quite a bit.
I've got an old junk Allis Chalmers garden tractor out back, I use it to drag things around the yard, to haul firewood up to the house and such. It sits outside 24/7, the hood barely covers the engine and its been known to get rain water down the the intake if it happens to not be covered. I've used my used Mobil 1 oil out of my 86 Ford truck, I've used 10w-30 in that thing now for 40 years. Since that truck don't get driven much I try to change it ever two or three years no matter what, usually its only got a thousand or so miles on it. The tractor leaks and burns oil, and has for as long as I've owned it. When the Mobil 1 comes out, it still oil still slippery and it don't smell like burn asphalt.
When I drain out the SuperTech oil it’s burnt looking, dark, and it looks like runny molasses. Mobil 1 will get dark too if you leave it too long but it’s never gotten to the point it looked like I could stain wood with it.
I've never done enough checking but the Mercury uses less gas with Mobil 1, and the difference is enough to notice.
I didn't realize it until recently when I started looking to buy gas when I was out of this area. I travel regularly to another property I own in PA, about a 5 hour drive from here. When I had the SuperTech oil in the Mercury, I could not make that ride on one tank of gas, I could get there but was risking running out of gas by the time I got back to the nearest gas station coming home. I sort of figured it was just the hills or the time o year, but now I'm a full year back on Mobil 1, and I've been back and forth to PA three times, and it will make it nearly there and back on one tank. It may actually even make it all the way back but I never cared to chance it. I got 16-18 mpg on SuperTech, I get 20-24 on Mobil 1, but again, not scientific, but the difference is enough to notice. When I put the Supertech in the car I was living in PA, it took four years to put enough miles on the car to need an oil change, the Mobil 1 in it now was put in a year ago, about 1,200 miles or so back. (The car is a 2003 with 43,011 miles on it as of this morning.
The 4.6L is by far their best motor, my 1998 CV, which I bought with 21k on it, had 368k on it when I sold it, my 2002 Town Car had 391k, and lived most of its life on what ever oil the dealer had in their tank. We didn't get charged for oil and filters, which is why I have a lifetime supply on hand for these motors. Its also why there's a 4.6L and CV chassis sitting under the 56 Ford Country Wagon I bought a few years back with a bad frame. A retired police cruiser with 69k on it donated its lower bits. I swapped in a Mustang rear fitted to the CV chassis gave me the 3.55 gears and the 56" width to let me use the stock 56 wheel up front we used aftermarket spindles and custom tubular A arms to narrow up the front to match. Both bodies had 115" wb. (144.7 in 02, 115.3 in '56).
The stock 4.6 and fresh rebuilt 4R70W trans should make that thing a very reliable driver when ever I get around to getting back to it. We did my buddy's 59 Ford panel with a 99 CV chassis about 15 years ago, he drove that thing daily till the day he died in his late 80's. I lost track of it, his kid sold it fast to the first person who waved a few bucks at him. I'd have bought it and kept it but he dumped it before his dad was even in the ground. I doubt he even knew what was under that thing, the buyer may not have either.
