do what i do, but only on different occasions, Never use the same depot. Kwik fit do a oil service, now dont run a mile, they use Magnetec oil, ideal for a TD5, now ring up for a price, they give you £25 quote, book it in, pay your money, and wait for the answer.
I do this every 6k, Kwik fit dont class 200, 300, TD5, TDv6. Its a discovery to them. they always charge £25 and I am always cheeky and ask them to fit my filter, a ebay genuine jobby.
Now I challenge you to find 8 litres of Magnetic for under £50, and never get dirty changing it.
Before you question this, I checked the oil going in, the barrels have either Mobile 1, or Magnetec.
Go on, try it