My s 430 has smoke coming from under hood after driving but not all the time temp gauage reads normal. I had oil and trans leaks sealed but it is still happening, what else could it be? Thanks

Yup, oil is leaking directly onto the exhaust and burning. Fix the oil leaks, normally always the valve cover gaskets, and replace the pcv valve(PCV positive crankcase ventilation valve). See can you put another PCV valve in the other valve cover and run it to the breather. The more of these lines you hook between the engine and breather, the less it will leak because vacuum is pulling all the pressure out of the engine block and crankcase so it won't push the oil out. My 383 small block has a bad front main seal, I hooked up another tube and it can't push oil out the seal. No more leaks. Hope you get her fixed soon Bro, you really look bad with all that smoke coming from your truck.

valve seals leaking oil into combustion chambers. Its a small leak that lets oil into the cylinder as it sits. It still leaks when your driving it at operating temp, but the leak is so small, its not noticeable. In a matter of a few hours tho, 4 little drops of oil will enter the cylinder, just enough to cause smoke. Drive on, no big deal unless it smokes under load, which means worn valves.

its time to look under the car yourself for a oil leak or even a plastic bag burning on the exhaust you have been checking the engine oil have you checked the transmission fluid level? the trans is on the drivers side i believe

It very well may be comeing from under the engine, sounds like there is an oil leak that only leaks under presure and is leaking on to the hot exhast.

ok one of the hose clamps is not tight enough when it warms up it expands and when it cools then it leaks so tighten all hose clamps when its warm and then again when its cooled and prob, aught to go away

if it is the camaro in the pick , they usually leak by the valve cover gaskets, right to the manifolds , that way the smoke and you don;t find the leak because it burns the oil

white smoke usualy tells about a leakage in the cooling. check that. dont forgett to refill. get it repaired or DIY. attention: could be really hot.

if it smells like fuel, a fuel line is broken. then dont drive any more since it can catch fire.

if the smoke is not white, go to the repair shop instantly.

http://www.americantechnology.co.uk/combined-offer-ametech-restore-oil-and-anti-leak-stop-leak-for-2-litre-engine-136-p.asp

It sounds like you have an oil leak. The head gasget may not be blown, but if there is a leak in the oil system the exaust will be smokey from burning the oil. Keep an eye on the oil level and it appears to be lower than normal, then thats probably the problem.