I am going at some Tad over due maintenance procedures this weekend …
This is how I approach SUPER HILUX ‘s YAMAHA variant 2UZ-FE with 153K miles …
I substitute 1 qt of the MOBILE 1 10W40 with the qt of LUCAS SYNTHETIC Formula ..
Back in T-TEN , in my senior year Engine Design & Theory final exam started after the first week .
One of the Lab’s we had prior to getting into rebuilding our own engines ( I had my 1st FJ40’ 2F to go at )
Out Professor set up a unique Torque Wrench

that had a analog dial on it to measure Toque yield and not a simple CLICK ing type you set to a specific #
So …
We had all the same drill bits V- head style ACE IRWIN Hanson top tier ones and all the same thickness 1” metal plates like 5”x5”
or there abouts ..,
We used straight motor oil first MOBILE 1
10w30 , conventional basic lowest common denominator MOBILE10w30 , you know the Cheap Azz MOBILE you got at a 7-11 or K-Mart auto section back in the day ..
We did the initial 2 drill bit torque yield

pressure tests using only the 2 base oils stand alone …
The MOBILE 1 drill bit lasted many times longer of course
The Lab Set Conditions were to steadily increase the pressure adding enough drops of oil to simulate the oil pump pumping enough to keep is nice and wet-down so to speak ..
The conventional mobile 10w30 started to smoke and the bit simply seized and locked in place then shear , snapped it ..!