The fan seems fine.
Will it make the engine last longer? Probably hard to quantify when there are so many other factors affecting engine life.
It would probably make a greater contribution if you were running standard mineral oil. In that case, it would probably help reduce buildup inside the engine. The synthetics have such a higher operating temperature that they are much less likely to create sludge during the brief, higher temps just after shut down.
Yet, it still may help and it's nice to feel like you're doing something positive to increase engine life.
