Not true. Synthetic oil has all of the conditioning characteristics of conventional oil. What's even better is that the molecular structure far surpasses that of conventional. In fact, the structure is such that contaminants cannot bond with it. Synthetic won't break down either. Have you ever noticed that the same "true weight" in a synthetic seems much thinner than that of a conventional oil? That's because the manufacturers don't have to add anything that thickens the oil to keep it from thinning when the engine is thermocycled. Ex: 90wt synthetic gear lube appears to be about the same thickness as engine oil and 30wt synthetic engine oil resembles the weight of cooking oil. The only thing that happens is that the friction package weakens over time. That's why although they say that you can go 12,000 miles or longer between oil changes with synthetic, they also recommend changing the filter and topping off with one quart at about 4,000 miles. This freshens the friction package and as long as the oil is not dirty, it makes it about as good as new. I'm not an oil expert but engines are my specialty. For more info check out AMSOIL'S site at www.amsoil.com. I hope this helps.
