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"This is how all Lexus's get their name. By the tank size. The IS300 has a 3-litre tank." It's for the displacement not engine oil capacity , it's a 3 litre engine the oil pan could be any size, depending on it's size and shape. Lexus DOES NOT name their cars after the tank size. The IS/GS/ES/LS denotes the chassis and the number, i.e. 300, 250, 350, 400, 330 etc denotes the SIZE of the engine. I'm pretty sure Lexus put only ONE size oil pan on the 3.0L engine. BTW, the 3.0 is derived from the Supra inline six.
The ambient temperature sensor in my 94 GS300 is located between the back side of the bumper and the condenser unit/radiator. It's about the size of a AA battery. That may be the best place to look.
I am almost positive.
The 2012 Lexus LFA has a 4.8 L base engine size.
The 2009 Lexus IS-350 has a 3.5 L base engine size.
The 2012 Lexus IS-F has a 5.0 L base engine size.
The 2007 Lexus IS-350 has a 3.5 L base engine size.
The 2013 Lexus IS-250 has a 2.5 L base engine size.
The 2011 Lexus IS-F has a 5.0 L base engine size.
The 2013 Lexus IS-F has a 5.0 L base engine size.
The 2011 Lexus IS-350 has a 3.5 L base engine size.
The 2014 Lexus IS-350 has a 3.5 L base engine size.