Lambda sensors can go off as they age and so the car could be running rich. Sooty tailpipes might be a sign...
I used to give my Prelude an Italian tune-up before the MOT, as it did use oil - early FRM bores. Always absolutely fine on the test!
Nick
“I find myself irresistibly attracted to cars that nobody else buys. The NSX is a classic of the genre because nobody buys it and yet it’s a fantastic car. It’s got a wonderful compactness and simplicity and unpretentiousness to it. Honda rudely continues to make them whether we like it or not, even though there can be no commercial logic in doing so — I thoroughly admire that.” Rowan Atkinson