in the morning...specially winters, the injectors work on flood mode, so if no blue smoke and no excessive deposits on exhaust tip, you r fine, how is the fuel average? there is a trimpot under steering to adjust AFR, but i wont touch it if everything is going fine..
for oil levels, my logic says that overnight stay would make max oil go into sump. however some of it will stay in head galleries, so stick should show max level...