I agree there is some very good info in the blog and no doubt that 540 Rat will forget more about oil than I will ever know (or want to). I like that the oil change intervals for autos and motos and reasoning for the intervals in Section 25 line up nicely with my own.
That being said, Section 8. 0W40 vs 5W30 vs 0W30 states:
As you can see from these actual Engineering test values, all the 5W30 oils provide better wear protection than any of the 0W oils. But even so, any of these oils would be acceptable for normal daily driver use. However, for highly loaded High Performance applications where the best possible wear protection is desired, the obvious choice would be 5W30 Pennzoil Ultra, API SM or 5W30 Mobil 1, API SN, which are the only oils in this test that provide INCREDIBLE wear protection.
But in the "WEAR PROTECTION RANKING LIST" (measured as psi) earlier in the article it is stated:
3. 0W40 Mobil 1 “FS” European Car Formula, ACEA A3/B3, A3/B4, API SN, synthetic = 127,221 psiThis new oil replaces the older version called, 0W40 Mobil 1, European Formula, API SN, synthetic. See below for the older version’s ranking position.zinc = TBDphos = TBDmoly = TBDThis new “FS” version was tested in Summer 2016. This oil produced the highest psi value ever seen in my testing, from any motor oil just as it comes right out of the bottle, with no aftermarket additives. Very impressive.However, a 40wt hot viscosity rated motor oil is too thick to be ideal for most engines. It is best to select the thinnest motor oil viscosity that will still provide acceptable “hot” oil pressure. And you do NOT need to select the “highest rated” motor oil, just as it comes right out of the bottle, from this Wear Protection Ranking List. There are many highly ranked oils here, that will provide your engine with excellent wear protection. So, you have many oils to choose from.I also went on to test this oil at the much higher temperature of 275*F. At that elevated temperature, any hotter and thinner oil is expected to experience a drop in Wear Protection Capability. This oil did have a 16% drop in capability. But, even at that elevated temperature, it produced an impressive 106,876 psi, which still kept this much hotter and thinner oil in the INCREDIBLE Wear Protection Category.I also tested this oil to find out its onset of thermal breakdown, which was 280F.
The above Mobil 1 0W40 numbers are much better numbers than
9. 5W30 Mobil 1, Advanced Full Synthetic, API SN, GM dexos 1 approved = 117,799 psizinc = TBDphos = TBDmoly = TBDThis was the latest current version of this oil when tested at the end of 2015. This oil is used by a number of Auto Makers worldwide as factory fill oil in their High Performance cars. The psi value of this oil, which came from testing it at the normal operating test temperature of 230*F, put it in the INCREDIBLE Wear Protection Category.However, I went on to also test this oil at the much higher temperature of 275*F. At that elevated temperature, any hotter and thinner oil is expected to experience a drop in Wear Protection Capability. And this oil did have a disappointing 36% drop in capability. At that reduced value down to 75,861 psi, this much hotter and thinner oil dropped down to the GOOD Wear Protection Category. You can avoid such a drop in capability by keeping the oil at a more reasonable cooler temperature.
It appears that Section 8. 0W40 vs 5W30 vs 0W30 is using the old Mobil 1 0W40 formulation and did not take into account the current Mobil 1 0W40 formulation.
So the question is, based on the test results in this blog, if Honda recommends a 40wt oil, why wouldn't I want to use the Mobil 1 0W40 as opposed to the Mobil 1 5W30? Or are the higher phosporous and zinc levels in the 0W40 vs 5W30 (1000 & 1100 vs 800 & 900 per Mobil 1) cause for concern?
Full disclosure - Love Mobil 1 and currently using Mobil 1 10W40 High Mileage with 2500 mile change intervals