Mobil 1 Question in Excellence. Do not pass 3K miles

[Perfectlap]

I saw an interesting question to the editor published in the latest Excellence.
A straightforward question but the answer made a not too subtle dig on Mobil 1's longevity.

I won't quote it directly but here's the jist of it

Reader: [I have a 2003 Boxster S in Phoenix. It has 54K miles driven daily.
Engine doesn't leak or burn oil. I change the Mobil 1 0-40 every 3K miles.
During summer I noticed a rattle after parking for 6 hours but goes away.
It's been 110 F for over 40 days now and I like your opinion on high viscosity to address the rattle. I am considering Castro Syntec going forward during summer and Mobil 1 0-40 during winter.]

Answer:
[We feel 3K miles is a good call given your choice of brand and formula.
We recommend 5-40 year round. However we prefer Motul 8100 X-Max or some other boutique type of synthetic. ZDDP levels are being reduced in mass marketed oils and the result we see are more problems and wear, especially in the valvetrain. The smaller boutique type lubricant makes are keeping ZDDP up above 1,250 PPM and preferably 1350 PPM and higher..]