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I am not saying STP is bad, but remember that the oil in the STP bottle that carries the additives may not be the best oil. IMO, the ZDDP additives on the market now in smaller containers (4oz) are a better alternative.

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I've been using STP for 40 years. I'll probably keep using it. Here's the thing. When I pulled my engine appart, the other 6 rod bearings looked like I just put them in. Same with the mains. There wasn't any bearing left in #6 rod, and #5 looked pretty bad. This engine was assembled by me in 2004......... Again, my question is, why mostly #6 or #5 rod bearing?