I wouldn't say 100k is a high mileage car - B16Bs tend to last longer than B18Cs due to lower piston speeds and higher rod/stroke ratio (less side load on cylinder walls etc...). Having said that my old B16B did burn quite a bit of oil. Get the engine up to temp and get in and out of vtec a few times and have a friend drive behind you and check for smoke. You can also go on the motorway, rev the car to 8500 rpm, lift off and let it roll while you're still in gear, when you hit 2000 rpm or so step on the gas again - if there's a cloud of smoke behind you it's an oil burner. A long hill will work for this as well, just let it roll down the hill in gear and step on it at the bottom. But if you're getting it cheap enough buy it anyway, I have been driving around in a smokey 9 for a couple of years until a healthy engine came up for sale at a reasonable price, you can do the same.