AZhitman

Hi guys. My 38k-mile '03 C5Z recently developed an oil leak that presented all of a sudden.

Further investigation on a lift revealed "blown-back" oil all over the lower pan, transverse leaf, and bottom of the upper pan (just behind the balancer).

A full scrubbing and cleaning ensued, followed by application of UV dye to track the source. Here's the weird part:

ALL the "usual suspects" are fine. No oil from the sending unit, filter, filler plug, balancer, or rear main - all mating surfaces are clean, dry, and revealed no dye.

The UV dye revealed (very clearly) that oil is seeping out of the center of the upper pan, immediately above the transverse leaf spring.

Is there a possibility that a rock or road debris somehow got on TOP of the spring and made hard contact with the center of the aluminum pan (maybe over a bump or decompression of the front suspension)? Has anyone ever heard of this? Car is pretty low on stock bolts.

I'm so damn bummed. NOT looking forward to the expense of R&R on the upper pan.

Thanks in advance for any guidance, guys.

Rob 02

Strange, there is another member with a similar issue.

https://www.corvetteforum.com/forums...-happened.html

I have never heard of it happening before.

runner140*

Nice find.