Nice Link on Oil
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#4
The reason for the reduced Zinc and Phosphorous levels are not entirely because of the cats. Think about, the levels of this additives would have been gone by the 80's but only now have they been reduced. The real reason is because Detroit went to roller cammed engines so these wear additives weren't necessary anymore so as a result, they started to be reduced. Basically, the oil companies followed what Detroit said.
As for no advantage of using synthetic on a stock engine, not only have I had personally experience, but dynos prove that swapping all of your old stuff for full synthetic (diff, trans, and engine) results in a power gain. It's not much (like 4%) but it shows that it does improve the way your car runs.
As for no advantage of using synthetic on a stock engine, not only have I had personally experience, but dynos prove that swapping all of your old stuff for full synthetic (diff, trans, and engine) results in a power gain. It's not much (like 4%) but it shows that it does improve the way your car runs.
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