I was at a dealer ship today looking for a project XJ and there was oil all over half of the air filter, it also smoked at start up. I said its bolwing by the rings, he said that normal. this is an 87 cherokee chief. 4.0 I6 with 169,000 miles. i have 134,000 on my 97 ZJ no oil on the air filter no smoke. I think he's full of crap..... any opinions from the jeep gods??