i just bought a 1992 cadillac brougham 5.7 350 need advice?

Oct 22, 2008
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car is super quiet and real good condition.it has a rebuilt engine in it and the mileage is about 20,500 now on the rebuilt! i looked all over under the hood and under the car for any leaks and found nothing! no shiny stuff anywhere.and all the fluids seem ok to.but i just wanted to know when do u think i should get a tune up done on it? and should i use bp premium gas in it so the engine lasts longer and stays cleaner? the manual says unleaded fuel only but i like premium because it has alot of cleaning agents and stuff for ur car.
 
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