I know that ppl have fanatical attachments to both oils, but which is really better?
XD-3:
0W-30 viscosity
Cheap ($3.75CAD/L)
Excellent extended drain performance
Available in 1L and 4L bottles, and probably 5gallon pails as well.
Has a 0W-40 'sister' product.
Contributes positively to the North American economy.
Available in Canada only.
CI-4 rating for diesels.
GC:
0W-30 viscosity
Expensive
Dyed green
Questionable extended drain performance.
Imported from a far away overseas land at great expense.
Available Canada/USA.