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Whenever I'm on the highway for a while n I park my far but leave it on I will notice a oil smell and some smoke coming off the exhaust between the engine n firewall is it a hose or valve cover?
 

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Most likely culprit is the oil pressure switch, on the T7 engine, the switch is directly above the exhaust system.

It's between the starter solenoid and engine block, not the easiest to get a wrench onto. To replace, it's probably easiest to remove the starter first.

After that, possibly one of the PCV hoses or even the oil separator.

Always possible it's the valve cover gasket, but I'd expect that to have easier to find traces of oil.

Best thing to do is to get the front of the car up on stands and crawl under it. Along with some bright light, getting eyes on to the problem area is probably going to be necessary.
 
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