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It appears the viscosity of many of Mobil 1s oils have changed based on the provided viscosities on their website. For example high milage 5w30 used to be 11.7-11.9cp at 100C, but is now showing as 10.1cp. I reached out for confirmation from Mobil 1 since this isn't an insignificant change, but...

Hey guys, I want to start by asking suggestions on what oil might be best for my car. I have a 1969 Pontiac LeMans. The car has a Pontiac 350 with large valve 400 heads and and aftermarket cam. The motor that it has was rebuilt by my father about 12-15 years ago, and has no more than 9000 miles...