The Smart takes a MB 229.5 specification oil.
Got about twenty quarts of the Pennzoil Euro 0W-40 when Maul-Mart had it for under a dollar a quart...
This will go in my Saturn SL2, manual transmission. It will use anything XX-30...
I changed 5th gear from a .730 to a .605, which dropped the RPM's by 1000...
Filter will be a Champion COS3600, a Rock Auto 97¢ special...