Light oil splatter on side of cowling

[Canuck]

I had a very light splattering of oil on the outside of my cowling after I flew about an hour last week (this was my second post-maintenance test flight). There was no oil I could feel or see inside the cowling. I've sent the photo to my shop as well, but any thoughts here? It felt like oil, not muddy water, but it was very, very faint.

 

[Canuck]

 

[JohnPhillips]

 

[cappy48]

 

[kf6iat]

 

[Domenick]

 

[Canuck]

 

[ATDMKC]

 

[VintonL]