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I mostly use shell 87. My GX is pre own so I am guessing that the guy who leased it most likely used 87 as well. I have not noticed any issue so far and I have about 90k miles. My recent Blackstone oil analysis came back good and no concerns.
I spoke to a Lexus master tech years ago about this same topic in regards to my old LS400 and 430. I was told that over time the use a 87, in an engine tuned to be most efficient on 91/ 93, will cause the catalytic converters to fail prematurely. By pulling timing to prevent knock you are creating a less than ideal combustion and a bit of fuel gets pushed through the exhaust. Eventually this will gum up the cats and they will be done. Yes, this same engine is used in other Toyota products with 87 being OK but the tuning is different. You really want the vehicle to run as efficiently as possible and not be pulling timing.
I spoke to a Lexus master tech years ago about this same topic in regards to my old LS400 and 430. I was told that over time the use a 87, in an engine tuned to be most efficient on 91/ 93, will cause the catalytic converters to fail prematurely. By pulling timing to prevent knock you are creating a less than ideal combustion and a bit of fuel gets pushed through the exhaust. Eventually this will gum up the cats and they will be done. Yes, this same engine is used in other Toyota products with 87 being OK but the tuning is different. You really want the vehicle to run as efficiently as possible and not be pulling timing.
That is a great explanation and makes sense. Any savings at the pump would be lost putting a new catalytic converter in. I’m fairy certain that there are engineering reasons that go with it as well - what convinces me is that these things last forever. At what they cost, I’ll spend an extra $10 a fill up to make sure it lasts. I do shop fuel though - usually get mine at SAMs Club since it is close and generally a quarter less than the regular places.
if the vehicle is the same, why premium fuel in the lexus?
The Prado 150 has the same chassis and body for the most part but completely different engine options than the V8 in ROW markets. Diesels, 4 and 6 cylinders only.
Engine tuning/management also must clearly play a major role with this motor, looking up Wikipedia there are wildly different performance numbers depending on application:
The 1UR-FE is based on the 1UR-FSE but lacks the D4-S direct injection technology. Originally used for Lexus vehicles in the Middle East, it was introduced in 2010 in other markets to replace the 2UZ-FE engine in truck and SUV applications. This engine produces 347 hp (259 kW; 352 PS) at 6,400 rpm and 46.9 kg⋅m (460 N⋅m; 339 lb⋅ft) at 4,100 rpm in the Lexus GS and LS. For the Toyota Land Cruiser and Lexus GX the engine produces 304 hp (227 kW; 308 PS) at 5,500 rpm and 44.8 kg⋅m (439 N⋅m; 324 lb⋅ft) at 3,400 rpm.
I filled up my wife's 2015 GX for the first time yesterday when I realized that is suppose to have octane 91 used. We have had it for 2 months and 87 has been ran at least 2 tanks. I am wondering what if anything it might have hurt. Sense I bought it used, I don't know for sure if previous owners used 91 or 87. Thoughts and or comments?
Use 91 as stated in the manual. Running 87 a tank or two won't hurt anything but some say it can cause damage in the long run. Not sure how can anyone offset the few bucks of saving by using regular at a vehicle like the GX.
Fortunately, there's a wide selection of gas saving devices available, not specific to the GX:
08-12-21, 11:57 AM
