Use exactly what the owner's manual states. If you do not have one, you can obtain one from your dealer or a salvage yard. This is word for word what it says in my manual: Fuel selection: Use only UNLEADED fuel, Research Octane No 91 (Octane Rating 87) or higher. For improved vehicle performance, the use of Premium unleaded gasoline with a Research Octance No of 96 (Octane Rating 91) or higher is recommended.
1995-2002 requires Premium Unleaded. 2003 requires Regular Unleaded.
Regular is fine
It should be right under the exhaust manifold and in front of the radiator. From the front view its in the middle of the engine.
It should. I don't believe they changed anything major between 1999 and 2000.
Unfortunately, the 2002 es300 was the first year that Lexus did not use a IACV in the ES300.
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