Yeah, it'll most likely last, especially if you drive easy. My step-dad once went 85K without changing his oil on his '85 Ford LTD.
He had a 90K service done and that was the last oil change. The engine seized up one day in 1992 at 175K miles.
It had run out of oil. He was a really slow driver, anyway.
When I cage, I drive an old BMW with the M20 straight 6. Like a lot of older German engines, they burned oil from the factory and preferred thicker oil like 20W50 even new. I run 5W50 synthetic and change it every 10K miles. The car has almost 300K on it and burns 75% less oil now than the manual says is "normal" LOL. If I put regular 10W40 in it, it'll burn a quart every 1K miles tho, that's "normal".
I used to check oil level every 2 times i filled up, on the 350 Chevies 1 quart per thousand miles is considered normal! Now my vehicles tell me when the oil is low so i don't check them as religiously.