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I have a 1986 chevrolet caprice with a Qjet and 305 only has 90K on it , And i was wondering if it was very important to put synthetic oil in it since the engine is almost brand new. Im asking this because i hear all type of stories on oil some say pay the extra buck to get full syntectic and...

I got me a 1986 chevy caprice classic brougham with a 305 4 bbl and i cant find the o2 sensor. I know on my old 1988 it was on the exhaust manifold on the right side but cant find it on my new 1986. And is it true that changing the o2 sensor will give me much better gas millage , even more...