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I have found the synth stuff dosnt get cloudy and smelly from sitting over time. I dont put that many miles on my trucks. Its just one less thing to worry about. I do synth engine oil too. The cat engines seem to like it better.

I switched my axles to synth it made a big difference. After a good highway run at 60mph my front hubs were only warm to the touch. And it was smoother driving.