*Always looking for better for a given application / situation ... It occurred to me from April ~ Oct. in the oppressive heat and humidity of Georgia - why should I care about running a 5 weight oil ? I just would want to know that the 10W synthetic oils are very close in quality to the 5W siblings is all (minus the VII's and the higher NOACK of the 5 weight oils) ... I wouldn't remember what you wrote about last month , last week or even yesterday . Yes , we all could put on a blind fold , spin on one foot in the Walmart oil aisle and walk to the cash register with what ever oil we touched first after we stopped - and there would be a 85% chance we could run it in what ever vehicle we own ... Where's the fun in that ? Its no worse than reading : "What oil do you recommend for my new ___ "? ... I't just a discussion is all - this ain't: "First Responder Weekly" - it's juts an oil forum .
Unless you're buying botiques where no costs are spared there's no guarantee that 10W30 has a lower NOACK or less VIIs than a 5W30 of the same product line , like Mobil 1 Extended Performance 5w30 has a good slug of PAO whereas the 10W30 doesn't seem to, same thing is noted with 0w20 compared to the 5w20, since the oil you find on the shelf is mostly made to meet a level of performance while protecting profit margins it's likely that the 0w and 5w products use better quality base oils than their 10W counterparts and that a 10W30 is not necessarily any better than a 5W30 even in hotter ambient.
Good comments...
I'd just run the 10w30 rear round. If you simply had to go lower,, then 5w30 in those 2 months. The 2.4 seems to "like" a 30 better.