With Pete Bergstrom, manufacturer representative's inputs it seems a small price to pay for using the recommended 1:20 oil to gas ratio. Cleaning spooge off a nitro plane 2 cycle engine is normal practice. So is living with a little 2 cycle oil spooge, too. Thanks for others pointing out that the upper conrod is bushed. With this engine being at half the price of its counterpart's typical pricing and priced around the cost of a 4 cycle glow engine should make it a popular choice.