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I bought mobil 1 motorsport oil 15/50 today at £28 inc vat for 4 litres from Lakeland Fuels in Enniskillen . Is this a good price ?
They also do mobil 1 0W/40 for £25 .
After 120k I think I would be tempted towards the Mobil 1 Motorsport. If 0W/40 is too thin for cars <3 years old then I think it most certainly is for a '91.