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Rear main seal query for mechanically minded sau'ers

Hi All,

Took my skyline about 6 weeks ago to a new mechanic who has told me the rear main seal has a leak and needs to be replaced. While it was up on the hoist, he showed me a single drop of oil on the bottom. 

However,

1. it hasnt been losing oil

2. as soon as he told me, i put some cardboard under the area where i park and in 6 weeks i havent had even one drop of oil fall onto the cardboard.

So does the rear main seal need to be replaced? or is there another possibillity for why there would be a small amount of oil on the bottom of where the rear main is?

 

Thanks for your help, id rather not spend a large wad of cash for something that might not be a problem!

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