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i would get it serviced if youre happy with the car theyre known for doing super high milegages,with no problems if you service them,to change over cars will be a false economy
You need 5 quarts in the Lexus RX300. Beware, the RX300 has a history of engine sludge problems (just search the internet for Toyota engine sludge). I would recommend Mobil 1 (this is FULL synthetic) and for viscosity I would recommend 5w-30 in the winter and 10w-30 in the summer. Your manual will verify the viscosity that I have mentioned. You must use good engine oil with this vehicle or else you will have an engine sludge problem and this could cost you a new engine. The RX300 is a wonderful vehicle and very reliable, but it requires some care that you must give it or else it will cost you a lot of money and maybe leave you stranded. For instance, change the oil regularly (no more than 4000 mile intervals) and also change the transmission fluid (no more than 60000 mile intervals). Search online for transmission failures in the RX300 - you'll find that the people who did not get a transmission flush were very sorry!!
If it is running perfectly I wouldn't think that you would need to replace the timing belt. You shouldn't need to replace that until 100,000-120,000 miles. I would definitely hold off until now unless you have start having some timing problems. Let me know if you have any other questions. Thanks for rating my response and for using FixYa!
My 2001 was having the same issue. I replaced the PCV valve and it fixed the problem. Total Cost 5.00. It is easily accesable but you may have difficulty finding it. It is located Left Rear Top of engine (Passenger side). Its brass and it screws in. I went online at my library and found diagram at this location. http://content.chiltonsonline.com/Repair/PrintView.aspx.
If you aren't mechanical, have someone who is check the car out. Specifically, the transmission fluid for color and smell (On toyota's they are to be changed every 30K miles, few drivers do this), and pull the spark plugs to see if they all appear relatively clean (a burnt looking plug indicates an engine problem). Ask to see the maintenance records. Oil should be changed every 3-4,000 miles if regular oil, 8-10,000 if synthetic.
The next BIG thing regarding maintenance is timing belt and water pump at 90,000 miles. Expect 500-700 for this, not at the lexus dealer. Probably double at the lexus dealer.
I would be interested under 12,000. Very interested under 10,000.
FYI, I'm driving a 95 ES300 with 170,000 miles and it runs like a top. These cars require very little in the way of repair if they are maintained. My goal is 300,000 just to see if it can be done. Unfortunately, I drive a total of 1,000 miles a month these days. So it will be a while. On the interior, you can have very nice new leather seats installed if the rest of the interior is in reasonable shape. Cost around $1,000 or a little less.
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