Get onto ya back and wriggle underneath look up into the bottom of the engine, run your hand round the casing to see if any traces of Texas Tea can be seen , or bolts shaken loose or anything else loose, , most people dont do that, I did and found nuts finger tight and oil seeping from a engine casing joint, so better to see that on ya back before the flight , than on ya back in some far away backyard or field..eh
Peter R-B