You can't put unleaded into a 1999 vehicle... you must have things confused. Some vehicles prefer high octane gasoline instead of regular. Using the wrong one (containing 10% ethanol can overheat and ruin the inside of some engines) Dual fuel engines can handle the ethanol.
Thank you! I filled the tank up so how sould I empty it?
I saw a post recently of taking off the fuel filter and allowing the fuel pump to empty the tank. This is similar to siphoning, you can sell the gas to someone and transfer to their vehicle using that method. It may be too much fuel for gas cans. A neighbourhood mechanic or dealership have large enough gasoline containers to handle this. A hoist would be handy.
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SOURCE: roaring sound comming from front of car
The deeper or bolder the tread cut will cause more 'road noise'. The only solution would be to replace tires with manufature recommended tread design. You could also increase insulation under your carpetting or spray on "body insulation" on firewall to dampen the sound.
SOURCE: 2002 Acura RL Premium unleaded fuel question
recommended is just that... a suggestion. most cars will run just fine on regular gas although you may notice a difference from using premium all the time. if you still have the owners manual it should tell you.
Robert
SOURCE: Low oil pressure after engine has heated up.
With the car warmed up, oil pressure should be 1.5 kg/cm^2 @ 800 rpm. If your not getting that much, you may want to get an oil pressure gauge (mechanics type) to check it. 
Using this type of gauge will give you an accurate reading. The stock gauge may not be very accurate, especially if the sending unit is old.
SOURCE: super-unleaded or premium gas for 2006 lexus ls 430
Well, of course premium is HIGHLY recommended, but it is not necessary.
You can use regular grade in your engine and it will not harm it at all. Modern engine management systems have knock sensors that detect lower grade fuel and make the necessary adjustments to your timing and fuel delivery systems.
All you will notice is slightly slower acceleration and a slight drop in engine horsepower.
Hope this helps...
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