96 STS drove it til it was at 25% oil life left, took it too get an oil change, and as im in a store they call and say no oil registered on the dip stick so they didn't want the liability.. so i buy 5 quarts and put it in.... it had a rough idle before but was pretty much cleaned after a throttle body cleaning, now i brought up codes and it has a random misfire, 02 sensor, and the reason my traction control light is on..i forgot... but the misfire was before ran out of oil and pretty sure its cylinder 5, and im pretty sure it inst getting a spark from the plug because im pretty positive oil is in it... there was a little oil in cylinder 6 and 8, cleaned it and it never came back, if i change plugs will i be good? and 02 sensor? if u can help thank you.
120,000 miles always been takin care of from previous owner as i can tell. no paint chips, few rips only in driver seat everything else flawless,bought at 115,000
really love this car, lemme know if you can help!! much appreciated