Incident Summary
During flight, the aircraft's windshield became covered in oil, accompanied by a slight drop in oil pressure. The pilot initiated a forced landing on an unimproved airstrip. Due to the restricted forward vision caused by the oil on the windshield, the aircraft collided with a berm during the landing roll.
Examination Findings
Post-incident examination of the engine revealed that it was extensively coated in oil. The most likely source of the oil leakage was identified as the crankcase vent tube, which exhibited the most significant oil seepage among the engine components.
Aircraft Information
A mechanic noted that the aircraft was equipped with low compression pistons, though no further details regarding the aircraft type or modifications were provided.