Your problem may be that it is a clone and not an original Honda GX35. The Honda 4 stroke trimmer engines can be run in any position while running or being stored and won't leak.I was told this was because of the oil sump in the engine.I had a Troy Bilt 4 stroke on a trimmer and every time I tilted it too far or upside down when using certain attachments it would leak oil. Try to find a real Honda or run it upright. Staton Inc