Hi
I don't deal with Triple QX, so can't say much on their oils.
There are ways of making oils so that the oils sound like they are the same, but they are actually quite different. There are 5 different basestock types to pick from.
http://www.opieoils.co.uk/pdfs/tech-...scriptions.pdf
The new Shell oils are a bit of an odd one, rather than using refined oils to make the group 3 oils, they use gases to make a purer oil, so you could look at the Shell synthetics as being somewhere between the group 3 and 4. Cheaper oils are always group 3, it tends to cost over £40 per 5L for a group 4 or 5 oil. Really cheap oils tend to be made from recycled basestocks, and they have often lost a lot of their properties due to the action of the engine.
Another way to save money in the production of an oil is to reduce the quality/quantity of the oil additives.
http://www.opieoils.co.uk/pdfs/tech-...dified-Car.pdf
One of the common things is to list an oil as 'meets requirements of (manufacturer specification)' or 'can be used where (manufacturer specification) is required'. Those oils tend not to be manufacturer approved and you are taking the oil manufacturer's word that the oil is up to spec. Getting proper approvals can cost hundreds of thousands of pounds, so that can be a big saving in the cost of an oil.
Quality control can also suffer during the production of cheaper oils. One company we deal with were testing several 5w-40 oils. One was found to be a 20w-40, one a 15w-40, a couple of 10w-40s and 5w-30s were in there as well.
I don't know the Triple QX, so don't know if any of that applies to it, but I do know that the Shell is a a decent, properly made oil that is a sensible price for what it is.
Cheers
Tim
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