Mobil SuperSyn 0w40

Has anyone had any experience using this oil with their 197? Costco are selling 4ltrs for 20 quid which appears to be very cheap! I've had a google around and it seem to be pretty well respected.

Currently I'm using Elf Evolution SXR every 6k but my car is due a service and the soddin dealers use semi synthentic so I need to give them some oil to use.

If anyone is in the South West area and wants this stuff cheap I'd be more than happy to sort them out as Costco is members only.

Cheers.