TwinTurbo.NET: Nissan 300ZX forum - Most likely the front main seal.
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Subject Most likely the front main seal.
     
Posted by ZiNnYc on September 05, 2015 at 5:32 PM
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In Reply To Oil leak question posted by Diplomat1 on September 05, 2015 at 04:44 PM
     
Message Especially since you were leaning the motor. Check behind the crank sprocket (remove the crank pulley, be careful)

However, since this is a new purchase, triple inspect the oil pan RTV and the rubber gaskets at both ends of the pan. (Handtighten, watch the mating surfaces.) Take a camera and record the bearing numbers. Do the front main seal along with your 120k maintenance now if you don't know the hx of the motor. (Which in that case, I would replace the oil pump preemptively, check the bearings, etc.) Up to your level of OCD/worry.

NYZC

     
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