It doesnt sound like an insane amount of oil but a little bit heavy. I would worry about using expensive oils in a car of that age, just use a regular semi synth no brand....no benefits from other stuff apart from more money wasted, change the oil filter often and it will probably outlast you
Do you notice any smoke from exhaust at any times? When I had my 8v T Spark I used it as a daily driver for 2 years on a 50 mile commute and used to race the ****** out of it, I used approx 1 litre every 3k miles, but everyones car is different.