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Mobil1 did eliminate their gas engine 5w40 oil off the shelf, like 10 years ago. No one knew why, just no longer could order it.

I don’t think it would void the warranty, due to the oil options offered as recommended by Toyota, for the same exact engine. Since where I live doesn’t see temp below 32 degrees but a handful of times a year, I chose something slightly thicker, just my own preference. Probably not a bad idea to...

5W30 synthetic has a higher viscosity index than 0W20. 0w20 is lower viscosity oil, and lower viscosity liquids are more thermally conductive yet fail at lower temperatures vs thicker/higher viscosity oils, but flow better at lower temps. If Toyota spec’s 5W30 synthetic oil for European T24A-FTS...

interesting in what way?

Yes, keep in mind BMW has very specific requirements to oil specs that far exceed API specifications. Plus oil filters cannot separate liquid=fuel and water contamination from engine oil, only solid contaminants. Condensation does develop during cold starts, the more cold starts-the more...

Thank you

Are you folks looking at the potential of a pathway to make this software enhancement something that would gain an E.O. From the lovely state of Kalifornia?

Yeah, it can be mounted under the cab, horizontally, and a fan switch and a relay can be used, or a manual rocker switch as well… either way, with the fan mounted to it, it creates it’s own airflow/heat exchange!

Something like this, just tap into the return line and wire up a temp sensor and a relay. Hose it under the driver’s side of the frame, under the cab, lots of room https://www.summitracing.com/parts/der-13950

Every automotive hydraulic system in an automotive application, will have a pressure side and return side. Pressure is developed by a pump with spikes the pressure from nothing to a specified pressure by an engineered requirement. Creating the pressure creates heat and hydraulic force to address...

Yes, that is correct!!! I would even have an inline transmission filter installed in the return line, to prevent contamination from circulating through the system again.

I promise you that unless the contamination floats, some will hide in a low flow area of the transmission pan. Same issue happens on sand casted engine blocks, like the ford 6.0 power stroke diesels.. ☮️

I think the software is different for manual vs drive mode… and that the OEM drive software will be fine with minimal use

With indirect/port fuel injectors to clean the intake valves- it can keep the intake valves clean, yet I can tell you on my Audi 4.2 engine, the intake flaps and runners develop carbon buildup, and no injector would clean this. Direct injection is loud but has much higher fuel pressure to then...

The alleged issue is contamination in the transmission, if the contamination is steel or iron/ferrous, then it will be attracted to the shift control solenoids in the valve body because the solenoids are electromagnetic switches, and the contaminants with find their way in the torque converter...

Maybe manually shift it for a while to see if anything changes? Avoid the same rpm range of shifts that seem to have a problem while in drive.

If you have a manual transmission, hold off on upshifting for another 5mph… same With the automatic, manually make upshifts and find out if “holding the gear” for another 5 mph, eliminates the problem../

Also… not common, but driveshaft balance could also be something to consider

No, but have you checked the tire pressure for all of the tires? Why at 40mph? Is the ride harsh at all speeds exceeding 40mph? is it harsh only upon acceleration? Or deceleration? Or constant speed? Or all of the above?