Well my friend has a 2010 efi cultus. He has been maintaining it on shell helix hx5 10w40 api sn and last week his engine started making a funny sound. Took it over to the mechanic and the cam was badly worn out. His mechanic said that you have been pouring very thin oil, thats y the cam failed. I suspect that this was because of driving it on api sn. However when I had presented his mechanic with the zddp logic, he started laughing. "Bhai mota haail daalna chahiye in gaarrion me"