Oil life is not as simple as a mileage figure, or what some computer tells you to do. The quality of oil is very important, but the driving conditions are more important. The typical filter isn't good enough to go 10k, and 7500 is pushing it with cheap stuff.
Modern oils are way better than old 30 year old standards, that's great for today's cars and people who don't know what to get. It's hard to go wrong with most any oils now. But filter quality is still a key factor, cheap filters are still bad for any engine. That's why some manufacturers require their own filter etc.
For long oil change intervals, consider that 90%+ of oil contamination comes through the air filter. Bad air filters or poor cleaning units like K&N, those let way too much dirt past, and the oil is thus, always black. A bad air filter will have fresh oil turn black in a day or less. Buy the best air filter you can get, that's more important than the oil.
I use full synthetic in all of my many many Fords, but I choose between the cheapest at Walmart($22 for Valvoline etc), and Amsoil($5 to $9 per quart), based on the engines needs and life expectancy. I still yet don't use the best Amsoil because my engines are all not quite worthy. My work truck SOHC 4.0 will get the best Amsoil soon, which I've run 9k mile before, and the oil was transparent at that mileage. I'm replacing the timing chain parts in it again(trans is out), so this time I'm installing two external filters. Research Bypass filter, those clean far better than normal filters, down to 2-3 microns, versus 15-20 for normal filters. With that and a large 1.5 quart external filter, I'll need close to seven quarts of oil. I like the extra capacity for this work truck, and the Amsoil Signature series can go one year or 15-25k miles. I will like that much more than changing oil once every six weeks or so as I do now(my 98 302 truck). That will be much cheaper and more convenient. I'll do the fluid change every Spring. Seven quarts of oil and one filter will run about $80 with shipping and tax here, for just once a year it's great. The bypass filters are good for a couple of years, and those run about $35 or so each. That's what all tractor trailers use, and those engines last 500k miles before rebuilds.