I’m also a bit surprised to see low viscosity with the PUP 5W-30.
True, the PPPP & PUP 30W oils do tend to start out on the thinner side, compared with their main competition (M1).
But you shouldn’t have had a lot of fuel dilution with this being a port-injected engine, and being in OK, and it sounds like you get your oil up to full ops temp every day.
I also have a T4R that has almost 3000 miles now, and will probably use some M1-AP 5W-30 that I got during the AZ clearance late last yr for $2/qt.
But, though I’ve always used M1-EP 5/10W-30 in my 07 Tacoma, I’m not married to that particular oil on this T4R.
Lately I’ve been intrigued by oils with very low amounts of viscosity modifier (VM) that use very high quality, thick base oils with naturally high viscosity index (VI).
One that comes to mind that is commonly available is Valvoline Advanced 5W-30. Its KV100 viscosity is 10.2, so, lower than PUP 5W-30, but still achieves a higher HTHS rating (3.2) than the PUP (3), despite the much lower VM content (an estimated 2.28% vs. 6.77% with the PUP). This Indicates that the VAS has a thicker, higher quality base oil, rather than starting out with a thinner base oil and then relying on VM additives to thicken it up at ops temp.
The advantages to that are (1) less shearing potential over the course of an OCI, and, (2) a potentially cleaner engine over time (VM polymers can cause deposits in high-heat areas such as piston ring lands).
I plan to try out some different oils on the wife’s new T4R, and get some UOAs, including the VAS 5W-30.
Thanks for posting the UOA!