cheapest I've seen for this stuff
Castrol EDGE 0W-40 a3/B4 gives you the confidence to demand maximum engine performance from today’s modern, higher revving sports, performance and luxury vehicles. This engine oil is perfect for cars requiring lower viscosity higher performance oils.
Helps to maximise short and long term engine performance
Improves engine efficiency, independently qualified
Delivers excellent levels of protection across a variety of driving conditions and temperatures
Reduces engine deposits to help maximise engine response
Meets or exceeds industry specifications
SaE 0W-40,aCEa a3/B3,a3/B4,aPI SM/CFVW 502 00/ 505 00BMW Longlife-01MB-approval 229.3/ 229.5Porsche a40Meets Ford WSS -M2C937-aPSa approval B71 2296