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I realize the near-impossibility of discerning "the best oil" from a few used oil samples. And yet, I often find myself looking at the UOA section. Maybe that's like bar-hopping: most people realize it provides nearly impossible odds to discern "the best life partner", but find themselves going...

It's not information as much as it is hearsay...pun intended. If I thought you'd listen (again, pun intended), I'd tally all the anecdotes that are directly opposite of yours...that ESP runs more quietly then Pennzoil Platinum. Your "observation" is the only one I can recall that would put a...

0w-30 ESP kinematic viscosity is 12.2 cSt/100°C. Pennzoil Ultra Platinum 5w-30 is 10.3 cSt/100C. What characteristic(s) do you think contributes to Pennzoil being "noticeably quieter"? I'm assuming that's at least a significant basis in your mind for stating the ESP is over rated, although I've...

Thanks for the clarification...I see what I did. I mis-read the Date sampled/Date received as the dates the oil was in service. So I thought the first two intervals were in December/January and the last interval was in May/June.

Is it cold in December/January compared to May-June where you live? If so, perhaps ambient temperature being warmest in the last sample is THE MAIN REASON for less fuel dilution.

You are assuming 0w30 uses "more VII"...depending upon the base oil, this would be false. In addition, some oils use pour point depressants to achieve a lower winter value. I have bought Mobil 1 ESP 0w30 at the same or lower prices than the run-of-the-mill 5w30 at the same store.

In the introduction, this phrase told me all I need to know: "...BITOG swayed me toward the Mobil 1 ESP 0w30, though both my current vehicles call for 5w30."

The molybdenum values seem to jump up and down with no reason. On other posted series of UOA's, sometimes I have seen values being affected by previous oil affecting the subsequent values (due to the volume of the previous oil never completely draining out). But these values don't follow a...

...and there is Mobil 1 ESP 0w30 that is thicker than most 5w30's at operating temperature, and I haven't seen any reliable reports of the ESP 0w30 shearing such that it would be considered "more than" most 5w30's.

As I said, the manual recommendation is base on CAFE requirements. Ambient temps can affect recommended viscosity choices...if not for CAFE... and those alternatives could be included in the manual. However, CAFE language doesn't mean a passenger car operated in usual fashion will be damaged by...

It's well-known fact often mentioned in the used oil analysis section, where those with experience notice slightly higher concentrations of some measured values specifically due to the PREVIOUS oil used. Molybdenum is a good example: an oil with NO molybdenum in a virgin sample will show a...

CAFE. Look it up. Has NOTHING to do with ambient temperature.

First, realize that "Florida heat" is not a meaningful variable in choosing those two oil products for your vehicle. Second, realize that you aren't removing all the oil from the engine with an oil change...there is a significant volume of the previous oil that remains in the engine that mixes...

As specified in the manual, with a 2.5 L Forester I go 6000 miles between oil/filter changes. As not specified in the manual, I use Mobil 1 ESP 0w30. At 37,000 miles now. No oil lost between changes as per the dipstick, although I don't know about the possibility of fuel dilution. MPG's in low...

Sounds like my son's Civic. He never was fastidious with oil changes. He sold that car with over 325,000 miles...still not burning any between his not-frequent changes at whatever oil change place he was closest to when he decided to take time to get it done. Stop-and-go California traffic for...

122,418. Had a seal leaking...adjusted exhaust valve clearance on #1...it was a bit snug...all the remainder were within spec. Mostly Mobil 1 0w20, Pennzoil Platinum 0w20.

Probably a good time to post this again: following Maintenance Minder to 10-15% and using off-the-shelf 0w20's on my Honda 2.4. This was suburban use 7500-10,000 miles per OCI.

Correct, the temperature and viscosity relationship can certainly be a curve, not a straight line.

LSPI tends to be a problem with some SMALL boosted DI engines. AMG engines don't fall into that category partly because they aren't "small".

Then how do you explain the fuel dilution commonly noticed in some GDI engines? Everyone else says GDI fuel dilution is unburned fuel slipping past the rings is exactly the mechanism.