Really you should check your fluids weekly, especially if your car is prone to using/losing oil. I do mine maybe once every 6 weeks when i hoover it but i am a bit lazy. Carry spare oil in the car just in case.
I've put the half used bottle of oil in the boot now, ready for next time
I'll try to make a point of checking the levels once a month I think. Thanks for the advice
If you're not sure of how much, just do a little at a time, then let it settle. It's a good idea to make it a regular check though, depending on how long you've had the car, if you know it uses / loses a little oil over time, best to keep the checks reasonably frequent. Coolant, brake fluid and screenwash are also good things to check at the same time - I suppose being thorough, you could check the PS fluid level too.
As long as the spec is reasonably correct, some slight variance isn't going to make much difference when topping up. Semi-synth is a blend anyway. Some Ford Zetec engines could be picky in terms of valves gumming up, with the wrong spec of oil - but I doubt that a top-up would cause that.
What sort of oil light came on - because normally the one on the dash will be an oil pressure warning light (which sometimes do seem to come on, or flicker, when the oil level is pretty damned low, but I'd say most cars don't have an oil level warning light.
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