macky_6 wrote:Just to be safe i added a litre of oil but the level on the dipstick didn't seem to change.
Did you check under the bottom of the car for approx a litre of fresh oil afterwards?
I would be a bit perturbed if I slung a litre in and the dipstick level didn't change ...
<edit>Not sure about 5g Ludes, but my Celicas used to have really sensitive oil level warning lights. If you went up a hill on a cold engine, the light would come on. Even with oil up to the top dipstick mark.
I'd have to think that if your oil is up to the mark and there's no leaks, it should be fine. But I'd certainly be canny about putting an extra litre in if it was already up to the mark - most dipsticks are a litre between the low and high marks. You really don't want a litre of extra oil in there.