Full synthetics also have ratings like 10w40, mostly all oils have a w rating. Oil goes bad by miles and the quality of filter you use not just with time like a year. You can easily go 8000klm to 10000klm on the good old dyno stuff with a quality filter OEM, VIC, or Union is not going to cut it.
The additive package is the most important part of the oil I rather have a dino oil with high zinc, moly and calcium in it than a semi that has much less. This is like comparing Mobil Delvac Diesel oil to some no name brand synthetic.
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