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I'm trying to rule out a head gasket before I take the heads off and replace them.

I noticed the a puddle of oil and coolant under the car when I let it run. A small amount of white smoke comes from the engine bay, but no smoke from the tail pipe. Also, no signs of coolant on the dipstick. Is it possible that it is just a bad intake manifold gasket?

I just bought the car and haven't driven it due to some suspension issues.
 

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Kinda hard to do a web diagnosis, check for oil in the coolant in addition to coolant in the oil. Do a compression test, if you are low on 2 side by side cylinders that COULD be an indicator of an hg also since that could be evidence of it leaking across, although not a guarantee. I'm not a Nissan expert by any means so i make no promises as to what my advice yields
 
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