So I was thinking the other day how everyone is changing their engine oil before the recommended time and thought why doesn't anyone change their Trans oil? I'm speaking manual trans but if you think about it there are way more parts that are in contact with each other in the trans compared to the engine and there is no filter in it. You figure there's the syncros, the gears themselves, bearings and no filter. So what is a top quality gear oil? I'm changing mine out after a couple of thousand miles. I would think after the break in it would be fine but I'm sure there are plenty of shavings and little filings in there in the beginning. Am I crazy? Maybe, but I'm curious if anybody has actually tested this.