Date registered: Jun 2008
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Double check the oil level, most people would accept that oil level is ok if it's a little over the top mark on the dipstick, but needs topping up if it is lower than the bottom. However on the vito, if there is too much oil this will cause the warning light to come on as the pressure will be too high and could cause problems.
The guy i bought my van from told me he had "topped it up with oil", it seems he didn't check whether or not it needed any first, or didn't take care to make sure that he didn't put too much in. Caused a load of oil to blow out all over what was a clean engine during the next couple of hundred miles. Luckily that's all that happened, no long term damage.
You may have to drain a little out, or just go for a full oil change. It might not be that, but worth double checking to be sure.