Wow, there are numerous top tier posts in here.
Plenty to learn.
It is hoped everyone takes a look in spite of the novel nature of my circumstances..
As always YMMV.
Several beneficial factors come together to create optimum results,
which showcase the potential of High Performance Lubricants oil.
First, it is established that my driving conditions are consistently easy on oil. All of my adult life, I have been a delivery driver subcontractor in the San Francisco Bay Area. I deliver everything from small parcels to light pallets. There is 70% highway driving. Most significantly, 200 or so highway miles are accrued 350 days a year. Five decades, 4.5 million miles, and most recent ten years of data make this point abundantly clear.
Second, there is this vehicle and this engine. I have 250,000 miles of experience with this engine series. I have my current 2022 Corolla Cross (M20A-FKS non hybrid), Previously I drove a Lexus UX 250h F-Sport (M20A-FXS hybrid} for 160,000 miles. I am not now seeing, nor have I ever seen any evidence of oil consumption or high fuel dilution. Dipstick level is constant and smells fine. The D-4S Port Injection/Direct Injection combo system works quite well. There is 40-41% thermal efficiency. Features are built in here such as coolant jackets, and oil retention grooves. At30,000 miles, the oil is still medium amber on the dipstick and dark amber {not black} when drained.
Finally, and most relevant is High Performance Lubricants oil. Experience in several forms of racing, fleet and industrial applications are found here. There is an obsession for quality control, and a vision to use best quality, no compromise ingredients. Industry best phd's contributed centrally to oil design. Needless to say, a 0W8 motor oil would have to be very cleverly created to perform like this.
Clarifications:
MPG 35 overall, sometimes better, but not a point of emphasis.
Spec is 0W16 SP/GF-6B.
Oil filter is Mobil 1 M103A Extended Performance.
OFCI 30,000 miles.
Garden variety 87 octane fuel, with an occasional tankful of ARCO or Chevron Top- Tier.
One bottle of Chevron Techron Fuel System Cleaner w/high dosage was used half way through this OCI.
Factory air filter was replaced with a snug, perfect fit Genuine Toyota air filter at 75,000 miles.
I do a little bit of dusty road driving at job sites.
Lots of spirited driving here, high RPM's and 75-80 MPH on highways.
I have used HPL PP 0W8 from the same batch since removing the factory fill at 3,000 miles. I have to wonder about the benefits of consistency, and the positive aspects of cumulative use of this oil. I am convinced my engine is sparkling clean and very well protected.
It is rightful to be concerned about such things as Nitration, Sulfation, Oxidation, Silicon, and Viscosity. However, my results sure do look pretty darn good. Are the rules evolving ? The proof in the pudding will come after 100's of thousands of miles of driving. My plan has been to pull the valve cover, cut open the oil filter, and take pictures, at 240,000 miles, which will be in two years.