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I would think that if there was such a problem with the newer oil, that it would affect the cam lobes and rockers before the rod and main bearings. I use an additive with ZDDP which modern oils don’t have. Removed by the “Greenies”. It is a must with Flat tappet lifters of yesteryear. I also find it criminal that the feds are forcing auto manufacturers to have a corporate average fuel mileage across the fleet. CAFE is total BS. Each manufacturer has a product line. They sell or don’t sell cars based on what the public wants to buy. Everything is not equal. To get to the acceptable BS CAFE value, they use a thinner oil and boom! Sometimes is doesn’t work. Case in point, GM’s current dilemma with LS engine failures. I doubt that using any good modern multi viscosity (10-40 of 20-50) oil with ZDDP would fail if the engine is assembled properly and treated respectfully.
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