Not to drag this on and I'll end it here, but Dyno's don't lie. You are not going to necessarily "feel" the extra torque, but it's there. Also, your engine would normally knock at hard throttle, but the ECU is pulling timing to prevent that. 100 percent 87 is not going to hurt your engine, many people put regular in their cars that require premium, but you are not getting the full benefits. But you know, at the end of the day, you are not hurting anything by using Regular, so if that's what you feel is the best, than more power (or less ) to you

 

This has been our point all along, nobody is saying it will hurt the car. It’s not going to hurt the engine but I personally want all the performance that the car can offer and I want that more than I want to save $20 per tank. For others fuel cost savings is more important and I understand that.

 

I'm with you on that. My 2006 Camry SE recommended Premium for best performance, so I used Premium. My IS350 required premium, and I could have put regular in it, but I used Premium to get the most out of the engine. My 2013 Sienna on the other hand recommends 87, so I use regular because then I would be actually wasting money

 

Correct......we never said otherwise. I only said to check YOUR engines spark table to see if your exact individual engine is okay with the gas you feed it.

My jag said 91+ octane only, it was fine on 89 with the new knock sensors and full refresh on the new engine I put in it. Never pulled timing......other ones pull on 91

 

Look up UR engine oil consumption. There ya go!

 

It absolutely will hurt it, timing pull occurs AFTER detonation even if very very minor. Drive that for a while and you will lose leakdown and start eating oil like SO MANY cars do. The emissions side of the equation requires the timing to pull and the mix to go rich as well to protect the cats and that increases carbon buildup in the rings.....and that gets you your oil consumption.

You really do not want any engine riding the knock sensors if you can avoid it

 

By why is it BS? What would Lexus benefit for saying you need 91 and not 87?

I think your LX get around 362HP when you use 87…I think the LC 5.7 dials it back too

 

You're the expert here, so there you go, I stand corrected

 

The way I always look at this is... if you deviate from what the manufacturer recommends, whatever happens after that is on you.

Now, there are some cases where the manufacturer's recommendation is not great - for example, stating the transmission fluid in many Lexus models is a "lifetime fluid". I don't think it takes a degree in engineering to figure out that the transmission fluid is... uh, doing a lot, and thus, it is getting heat-cycled and broken down over time. It makes sense to replace it every few years/10's of 1000's of miles.

 

You're being way too nice. Lol
I'll turn the dial up from "Not great" to very wrong. Haha

No such thing as life time fluids, mfg recommendations are debunked. Lol

 

That’s my mentality, maintain the car at least the way the manufacturer recommends. When something is “lifetime” you have to ask yourself what do they consider the vehicles life? Is it 150,000 miles? Probably. So if you want to keep it longer than 150,000 miles you are going to be well served by changing that fluid. Same with oil change intervals. If you’re going to keep it for 100k+ you should change the oil more often than every 10k

 

I change the "Lifetime" fluid in my Sienna about every 70K. I'm currently on 170k, so about to do another "Lifetime" fluid swap

 

Yeah, kinda weird wording. "Lifetime" of what - the vehicle? The transmission? Maybe Lexus would rather we didn't think too hard about it...

Planning to do my transmission fluid every 40k, FWIW. That seems to be a common practice for folks with cars that have this transmission, especially given I drive it spiritedly.

 

My favorite is when the car manufacturer says the trans fluid is lifetime, but the transmission manufacturer says "eeh, not so much. Change it every 60 or 80k".

 

In this same note, Toyota recommends 10k oil changes on their vehicles, but I still do 5k. I used to send my samples occasionally to Blackstone, and they told me based on the results that I could go about 7k or 8k (I use fully synthetic), but I still stick to 5k