Gotta 200 mile drive to do in about 2 hours time from now and have just noticed seriously down on engine oil. Having never had to put any in myself before as its always been ok up to service intervals am now concerned about which to get. Seem to remember it needs to be synthetic etc.... there's a Shell garage around the corner....is there a shell product sutible?.... quick reply plse.

 

P.S. Its a P1 if that makes any difference.

 

Subaru say Castrol through out the car