Hi redstokie
Welcome to the club and forum
I have a C20XE (are you 2.0 or 1.6?)and funnily enough I am droppping my sump in the next week or two. The dealer is correct, you need two sump gaskets to go either side of the windage plate. if you have a look underneath the car you will see.
I too have a small oil leak at the front and someone on here recommended putting small amounts of sealant in certain areas to help prevent it. I can't recall details off hand but a forum search will bring the info up again. If I find it soon I will post here but chances are someone more knowledgeable will come along soon and advise.
Edit to add - here is the info which was actually on one of my old threads 😳 - never got round to it until now but the leak was never that bad and tightening up the bolts helped a little I think.
Thread is here
Are you aware of the foam bafle that lives in the sump? Ideally these should be changed regularly (every two years) to ensure they don't degrade, break up and damage the engine. When I bought my HPC, which was 10 years old at time, I found that the baffle had never been replaced! Found lots of what looked like crispy seaweed in the pan but luckily I got away with it and my engine wasn't damaged.
A tip when replacing the sump is to get some short pieces of studding to insert into a few bolt holes to help guide up and hold the pan as you get everything in place. Should be able to get the studding from most hardware places.
Cheers
David
Edited by - Lotus Boy on 14 Apr 2011 09:58:58