Just did an oil change on my BMW. The 5 litre jug of Castrol Edge 5w40 was the typical golden color. The 2, 1 litre bottles I bought today of the same Edge 5w40, the oil was a green color. Kinda like the old GC. The back of the bottle says made in the USA. Has anyone else had the same oil color? Is this some new formulation for the 5w40? It almost has the same color as coolant.