If you use Castrol Maganatec 5-30 or 10-40 in your Mog go to your nearest ASDA store. It's on sale at £20 per 4 litre can. I believe the retail rice is about £36 per 4 litre can. I have bought enough for my oil changes for 2016.

David cop

1997 Plus 4, Metalic Blue.
2000 Toyota Yaris. (The Tardis)