Does the 09 es350 need 93 octane gas or will it run on 87 octane

Octane is a chemical that is added to gas to make it less explosive. The reason for this when the piston inside of your engine compresses the fuel air mixture, it can explode before the spark plug fires. If this happens, the piston will fire down the cylinder wall before the crank shaft and the piston rod reach their piviot points.The higher the octane rating the less explosive the fuel and the higher the compression can be in the engine - thus more horse power..The lower is just the opposite. ---------- For your Lexus ES350 Octane 91 is recommended.Engine will work fine with a lower 87 octane but not produce the maximum power it can achieve with a higher octane. It may also get worse fuel economy with lower octane, so be sure to measure your MPG on a tank full of 87 gas and then do the same with 91 octane gas. You may find that you actually save money with the higher octane based on the greater fuel efficiency. In any event, using 87 octane gas will not do any damage to the engine so you don't need to worry.But using octane 91 is advisable for longer life and good fuel economy rate.I suggest octane 91.--------------This should help.Thanks.Helpmech.

You should have a factory affixed sticker inside gas compartment cover listing premium fuel only or also listed in your owners manual. Otherwise if you notice that you're vehicle is making a pinging sound while accelerating or climbing a hill for instance then you may want to step up to 89 or 93 octane and try to avoid purchasing fuel with ethanol added it's **** and degrades your fuel quality/octane ratio