I have a Mazda sourced M5ODR2 manual trans in an older Ford F-150 and it has a typical leak from the rubber plugs that go hard and shrink/crack over time. The plugs are on the top of the transmission. I have the replacement plugs, but I won't be able to get to the repair for a while, so I am wanting to know if anyone has experience with any product that will slow the leak down by 'swelling' up these rubber plugs. I know this is posted in the Oil additives section, but it is an oil additive product that I will likely have to buy for my situation. Thanks in advance for any useful suggestions----