If your oil stinks of fuel then I assume fuel is getting into your oil.
The only place this could happen is by it leaking down past the rings on the piston(s)......that I can think of anyway.
May be worth putting fresh fuel in, peaky stuff like V-power doesn't tend to last long from the little I've learnt about it, I was told once (bag of salt with this) when I did the PR stuff when they changed it from Optimax to Vpower that it only lasts for 2-3 weeks before going off. Might be worth reading up on it, may be fine, sure they'll state it somewhere on their website.