Phillips 66 New Oil: Lycoming Additive

The new Victory AW 20W-50 engine oil combines multi-viscosity, ashless dispersant with built-in Lycoming anti-scuff treatment.

In 1977 Cessna introduced the 172 N model, employing the newly developed O-320-H2AD engine and allowing Cessna and Lycoming's common parent to save money and offer slightly more horsepower. Unfortunately, the engineering compromises made in the valve train resulted in camshaft lobes and associated lifters that were quite corrosion intolerant. Cost saving led to minimizing the size of the hardened surface, so the contact pressures became extreme. The design was barely adequate, as long as no rust occurred. But any rust increased pressures beyond what the oil could handle, and metal-to-metal contact would occur, rapidly wearing away the valve train components in as little as a few hundred hours.
To continue reading this article you must be a paid subscriber


Subscribe to Aviation Consumer

Start a subscription to Aviation Safety for just $18. And access all of our online content - over 2,000 articles - free of charge.
Subscribe today and save 48%. It's like getting 3 months FREE!