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Also - found the #4 intake gasket split. Replaced it. Reset codes. CEL is back on but hasn't flashed again.

So I thought maybe there was when it was cold out, but I wasn;t 100% sold on it. Now that it's warm, there is absolutely no smoke. And for what it's worth, I've been checking my oil often, level is completely consistent.

Leakdown test confirmed 35-40% leakdown in cylinder 4. 99% certain it's an exhaust valve leak.

Ok this is going to be a long one so bear with me... I have a '16 Rubicon Hard Rock with just under 60,000 on it. Automatic. Babied, regular oil changes. About 16 months ago, my CEL came on and I got a cylinder 4 misfire code, P0304. Absolutely no symptoms whatsoever. Took it right to my local...