yeah that is a good point...high compression or turbocharging will cause the need for more frequent oil changes...compression more so, because you get more heat all the time regardless of how hard to you drive...which deteriorates the oil faster...and flogging a turbo'd engine often will create huge amounts of heat throughout the engine...doing the same thing, but a turbo'd engine out of boost will be no harder on the oil than the stock engine for the most part...
A good way to gauge oil change needs is to moniter fuel consumption...I have been too lazy to do this, but its a great way to do it...figure you get roughly 30 mpg regulary...So then say you need to change the oil after every 200 gallons of gas (roughly 6,000 miles with normal driving, which is pretty standard for mild engines with synthetic oil... and sorry for you Canadians...too tired to convert right now)...But this works well because if you drive harder, you get less miles per gallon...which gets to 200 gallons consumed with less overall mileage than you normally would have...and vice versa, you baby it you could get possibly 8,000 miles out of 200 gallons...
I have been meaning to do it this way for a while, but always forget to track the gallons...I will definately do it with the built engine though...