Perhaps I can throw something into the mix - My cdt is coming up to oil change time - 1500 miles to go. It has had Mobil I in for nearly 15000 mls - oil on dipstick still looks like new and has not needed topping up since the last service. However due to the price of Mobil 1 I am thinking of taking car to National Tyres who will do an oil and filter change for £22.50 using Visco 3000 fully synthetic - anyone got any thoughts?
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