For those technically inquisitive folk here's some great details on engine family found in the 2nd gen NX and RX family

Found this graphic series on Toyota's A25 series engines, here is the main site:

https://toyota-club.net/

Toyota engines - A25·M20 - Dynamic Force series (R4):

Shows the Lubrication system and more importantly the pump operation details describing the: "Trochoidal pump is driven via an additional short chain. The ECM controls the pump operation by oil pressure control valve, depending on the engine temperature, speed and other parameters."

https://toyota-club.net/files/faq/18..._df_r4_eng.htm

 

One of my favourite sites, loads of technical information across all Toyota engines, transmissions, fluids, models, AWD systems, etc. I can only assume a lot of this information has been skimmed from the service manuals or perhaps internal technical documents. Those of you that watch TCCN Youtube videos a lot will sometimes recognize the diagrams he uses as being the same provided here. The info is not always completely up to date, but I've yet to find any place that does better without a subscription fee.

 

Thanks! Great Site!

 

At this point moving forward with 2023+ models they should be fairly reliable correct? Seems like Toyota is putting them in almost their entire lineup so the design must be dialed at this point. Assuming the EGR fix comes from the factory on 2023+ models

 

To what 23+ EGR fix for the A25A engine do you refer to? I've not heard of any serious issues related to EGR in this engine. The previous generation Lexus CT and Prius were notorious for intakes clogging up due to EGR but the D4S engine design thru most Toyota engines over the last 8 yrs has greatly reduced the impact of EGR on those engines that have it (the Turbo model doesn't have one at all). But aside from that, the A25A engine has been quite reliable since it first showed up I think in 2017 or 2018, a few minor issues the first couple years. So yea, decent engine but alas, the A25A engine is pretty much already obsolete, smaller, more efficient, more powerful engines on the way to replace these "dinosaurs", LOL.