Just a quick heads up. I noticed that Asda are doing Castrol GTX Part synthetic, 10/40 and 15/40, for £13 for a 4 litre bottle. Don't know when the offer started or when it will finish but seems a good price to me.

Ian.

Also have GTX Magnatec fully synth at £20 but that might only be in larger stores. (noticed it in Preston Fulwood yesterday).