The biggest problem with own brand oil is the source it comes from.
Many independent oil producers (like the ones who make most "own brand" oils) often source their raw materials from the cheapest source. This means that there is often no consistence to the quality of own brand oils as the raw material this week may well come from a different oil field to last weeks batch.
It's well worth asking "Who makes your own brand oil?". If it's a major oil company (and they can prove it - ask for coshh sheets) then I'd buy it. If not, I'd avoid it like the plague.
Just because an oil says 10W40 on the pack doesn't mean it's the same as a different brand with 10W40 on it. It's a bit like Heinz and Tesco baked beans, just you shouldn't eat engine oil, or put baked beans in your engine, but you get the idea.
, had to ask parts guy to double check and yip he's right, thats the price inc vat, told him to leave it for now. 2 days later called in to independant vx factors and got 10 litres for 33.60 inc vat , the exact same oil half the price 
, dick turpin without the mask springs to mind. lesson learned folks 
