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[new echo owner]

Have used a couple of those, seems to work OK.

Yes, there is a retainer for the rear main seal that you can remove; however, be careful when installing it back on, since you will be trying to fit the seal over the crank while trying not to mess up the sealer for the lower edge where it seals with the oil pan. There is a metal gasket between the retainer and the block.

N.E.O.