....as I said in another thread, I am still a "baby in diapers" when it comes to the new technology coming from a 2022 to a 2025....I just discover that when in auto start/stop mode (switch is on) occasionally and very fast I saw a short message flashing "battery charging" so I have turn the auto/stop mode off every time I start the car....is this something that has been discussed in the forums before with other model years? .... is it normal foe this to happen?....if I use the "auto star/stop" bad for the battery?...is it worth the risk of weakening the battery?..
I am all ears, since the group here appear to be very well informed..thank you all for providing help and advice to all of us..

 

Since you don't mention that you have the 350 hybrid, I will assume that you have the 4 cylinder turbo engine.

This is just my most humble opinion, and I am sure that some will disagree, but the start/stop feature is hard on the starter (excessive use) and will most likely shorten its lifespan. Additionally, if the engine shuts down while the engine/turbo are still hot after "spirited" driving, it COULD lead to the oil "coking" in the turbo. Using a quality synthetic oil and not pushing oil change intervals (keep the oil fresh) will certainly help mitigate any potential coking issues, but for me personally I don't want to take that chance.

These are my two main concerns with the start/stop feature which is why I disabled it permanently shortly after I took delivery of my RX.

As for the battery, I think that the battery monitoring system does a good job monitoring the battery's SOC (state of charge) and doesn't let it get too depleted, hence the disabling of the start/stop feature.

 

Thanks I appreciated your insights...I do disable the start/stop option as soon as I get into the suv all and every time.... I used to have a show 1985 Mustang SVO (4 cyl turbo) and yes that is always the concern with turbos..the oil cooking effect since they heat up fast!!
I just bought an RX 350 premium model ..used to have a 22 RX350 ...cant break old habits...<S>...sorry you said "coking" twice..did you mean cooking effect, as in overheating of the oil?....THAT is what I am referring to...what is coking?

 

Did you purchase a Auto Start Stop Eliminator? If so which make/model do you have and how long have you been using it.

TIA
.

 

Coking is when the oil 'bakes' due to the very high temperatures in the exhaust side of the turbocharger impeller.

Today's synthetic oils are less susceptible to coking. IMO, it is not a concern unless you are at a racetrack and your exhaust system is glowing RED.
The turbochargers have water cooling as well as oil cooling these days.

 

I don't worry about extra wear on the starter as the starter has been uprated to handle the additional starts. In fact it has been so highly uprated that Toyota actually sets a limit on the total number of starts before it throws a CEL and requires you to install a new starter to clear the code. 384,000 starts

The battery on the other hand seems to be the biggest pile of junk and I don't trust it at all. Between the reports of the hybrids with dead 12V's and the fact that I continuously find mine at 11.8V, I expect it's going to leave me stranded sooner rather than later.

 

You actually don’t have to turn start/stop off to prevent it from working. On my 2024 model I can stop without activating it by not pressing hard on the brake. I get a message that says press brake harder to activate start/stop.

 

Yes, the cooking of engine oil due to high temps is referred to as "coking". Perhaps this will help explain it.

Edit- Sorry, just saw where this question has been answered.

 

I have had my start/stop override devise for about two years now with no issues. I think I got it through AliExpress, but I could be wrong. Do a search in this forum- I did a quick writeup on installing it. Turns out (thanks to another forum member) there is an even easier way to install this. All that needs to be removed are the two side panels of the center shift console. Super easy to install.

 

I've been using CTEK battery tenders/charger for years. If my cars were to sit for a few days without driving
I can plug it in and efficiently bring it up to full charge.

CTEK's are about as good as it gets. Ferrari makes them available, Corvette and many others. They have their
names put on them, but, buy them from CTEK. And, they are not expensive. Normally just over a $100. That's
well worth it. You can get them dedicated to different kinds of batteries. Mine will do Std. and AGM batteries.
Easy peasy.

How many have seen pics of Jay Leno's massive car collection?? See the wiring running to each one? Guess what....
every vehicle has a CTEK tender/charger hooked up to the battery. He drives all his vehicles and or has one of his crew
take them for a drive. They do not just sit and look pretty.

 

We have had our RX350h for almost five months. Close to 3000 miles. I have never noticed the start/stop activating a single time. Perhaps because there has not been a time here in SE Texas that the Air Conditioning has not been on Max from the Get-Go.

I have had my 2016 F150 since new. I do notice the Start/stop activate pretty often. Never had any issues. Never read about it being an issue. (Though a lot of owners don’t like it.)
My OEM battery lasted well over eight years. no starter problems.

 

With a hybrid you don't have the option of an *** on *** off button do you?

 

Auto start stop isn't really a thing on hybrids, it does it by itself without announcing it. Your AC also runs on electric so it does fine without a running engine. That engine is most definitely shutting off, I have never seen a hybrid that doesn't at a stop light.