LX 600 fuel question

[stonepa]

If you are not keeping it past 150k-200k then you may never have any issues. Might as well not change transmission fluid , AHC fluid, or diff fluid while at it to help save money.

You will never have any issues with running regular unleaded. Ever. Now fluid changes? You may notice a long term issue if you skip those.

But please continue doing what you want. Matters not a bit either way. Much of what you hear required for Lexus engines is nothing but marketing and product differentiation. And it seems to be working, reading many of these comments.

 

[unclemat]

Another reason I don't want turbo engines. You might be buying a used one, where the user routinely was exposing it to knock by running low octane fuel, geez.

 

[Oakleyguy]

Another reason I don't want turbo engines. You might be buying a used one, where the user routinely was exposing it to knock by running low octane fuel, geez.

Modern engines have octane sensors that will adjust ignition timing (and boost) appropriately to the fuel they are using.

 

[unclemat]

Modern engines have octane sensors that will adjust ignition timing (and boost) appropriately to the fuel they are using.

You can't rely on them 100%, especially that modern engine are pushed to lean out the engine longer than it is safe. Thank CAFE.

One is a fool to run low octane fuel in an engine tuned for high octane one, honestly. Ok in an emergency while keeping the load on the engine low, but absolutely not on a regular basis.

 

[Chrisek]

You will never have any issues with running regular unleaded. Ever. Now fluid changes? You may notice a long term issue if you skip those.

But please continue doing what you want. Matters not a bit either way. Much of what you hear required for Lexus engines is nothing but marketing and product differentiation. And it seems to be working, reading many of these comments.

Would be interested to see an LX600 over 300,000 miles on just regular unleaded and see for a fact what’s what. Have there been any yet? That reply seems like stating facts regarding the fuel. Have any of these TTV6’s been past 200k in any body yet? LS, Tundra, LX etc?

 

[stonepa]

You can't rely on them 100%, especially that modern engine are pushed to lean out the engine longer than it is safe. Thank CAFE.

One is a fool to run low octane fuel in an engine tuned for high octane one, honestly. Ok in an emergency while keeping the load on the engine low, but absolutely not on a regular basis.

I guess I am a fool. But a fool that has been at it for 40 years. Get to central America and a lot of Canada and there is no premium. I’ll take my chances in the real world.

 

[stonepa]

Another reason I don't want turbo engines. You might be buying a used one, where the user routinely was exposing it to knock by running low octane fuel, geez.

I am guessing few if any owners will ever drive any of these hard enough for anything to happen. These aren’t BMW Ms. Not that kind of buyer.

 

[unclemat]

I am guessing few if any owners will ever drive any of these hard enough for anything to happen. These aren’t BMW Ms. Not that kind of buyer.

But that kind of owner will lug it. Also bad.

 

[TexasHusker]

"I just spent 100K+ on a new vehicle and lord knows how much in insurance but I'll be G-Damned if I am gonna spend an extra .30-.50 a gallon on premium, that is a rip off!"
Every person citing "this is the same engine as x vehicle" and "these are built for the 3rd world"

Is that what I said?

 

[1MAC]

I've always been curious how altitude affects octane and the engine tune. Can someone who knows more about this chime in? With the engine tune, is it for a certain mix of oxygen and fuel and do lower oxygen environments affect this, if at all, with modern engines? I've always run 85 in my 100 and 200 and never had any issues but I wouldn't do that if I had a 600/700.... And, how/why is the tune different on a Tundra? Is it because a truck will more likely tow?

Higher altitude means lower barometric pressure and therefore lower cylinder pressure. You have less propensity for detonation (knocking) and therefore lower octane fuel is fine. That's why you can buy 85 octane gas in Colorado and they don't sell it down here in the flatlands.

There are no "lower oxygen environments" on this planet where you could drive your vehicle. The atmosphere is pretty uniformly 21% oxygen.

 

[nickandrews]

Higher altitude means lower barometric pressure and therefore lower cylinder pressure. You have less propensity for detonation (knocking) and therefore lower octane fuel is fine. That's why you can buy 85 octane gas in Colorado and they don't sell it down here in the flatlands.

There are no "lower oxygen environments" on this planet where you could drive your vehicle. The atmosphere is pretty uniformly 21% oxygen.

Thank you! I wasn't thinking barometric pressure - thanks for clarifying.

 

[stiffarm]

Higher altitude means lower barometric pressure and therefore lower cylinder pressure. You have less propensity for detonation (knocking) and therefore lower octane fuel is fine. That's why you can buy 85 octane gas in Colorado and they don't sell it down here in the flatlands.

There are no "lower oxygen environments" on this planet where you could drive your vehicle. The atmosphere is pretty uniformly 21% oxygen.

Thanks for the physics lesson. IYKYK