Oil change

Wyrmrider said

I think that 15-50 is for supercars, late vetts take 0w-40
see that column with the phosphorus- that's what your are looking for
after break in and without really stiff springs I think 800- 900 works fine
Oil is constantly being re-formulated stay on top of it

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FWIW.... Just be aware that a 15W50 full synthetic at cold temps (like below 40F) is going to be as thin as a 5W dino oil at those colder temps. The 'cold' temp viscosity of motor oils is measured at 104F and the oil's behavior at much colder temps can be quite different depending on the oil material. Pout them both out of the bottle at room temp and the lower viscosity of the full synthetic will be immediately obvious.

So a 15Wxx Mobil1 is gonna work OK for most street engines, even at cold temps.

And yes, the old stock spring pressures seem to not be an issue with the now-lower ZDDP levels. From several research articles read, the ZDDP gets 'activated' when pressures on the microscopic 'peaks' gets past a certain level, and the less the spring pressure, the less ZDDP gets used or needed. I personally will try to stick with the older, higher levels regardless.