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Re: 525 SC's life expectancy
Mine has 380hrs. Redid the top half last Spring at 335 hrs. It really didn't need it, except for I had a pitted valve from an exhaust manifold leak. I also wanted to add a little hp and chnged to a roller cam.
Bottom is untouched. Only uses 1 quart of oil every 20+/- hours. My driving habits are about the same as you describe. I would expect the engine is good to go for another 300hrs.
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