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MT transmission & rear differential oil change


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I just changed the transmission oil and rear differential oil on my 97 OBW with 128 000 miles. I have a few questions for those that have done this before. First question is: Should there be a sealing washer on the transmission drain plug? Mine did not have one and I tried one of my engine oil drain plug washers but it was too small. So I put it all back in without a washer and filled it with redline 75-90NS oil, but now I'm wondering...

 

2nd question: The transmission oil looked fairly clean but the rear differential oil was quite dirty. Is that normal? Nothing unusual was on the magnetic drain plug.

 

last question: I just used some teflon tape to seal the rear differentail plugs. Any problems using that.

 

Thanks

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Thanks. Is the mating surface on the transmission case where the oil drain plug seats flat or rounded? Mine was rounded which kind of puzzled me as I have never seen that on any of my other cars. I'm wondering now if the old crush gasket was stuck on the case realy hard. On the drain plug I could see where it was only contacting that rounded mating surface.

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Thanks Hieu,

 

That is what I was affraid of. I guess I will just keep an eye on it and hope it does not leak. It did not leak before I changed the oil, and there was no sealing washer. I will definately get a sealing washer for next time. Had I not used the Redline oil I would just change it out again and put a sealing washer in, but that Redline oil is expensive stuff.

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Q2: On my 2002 MT Forester, I drained the rear-diff oil at 1000-km, and it was a 'dark-grey' opaque colour.

I drained it again at 8000-km and at 50,000-km, and each time the oil was clear.

 

Break-in is harder on the fluid now it stays cleaner!:)

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My rear differential oil was dark and thick. I'm glad I put the Redline synthetic in there. Might help on fuel consumption especially in the winter. I was realy taken by surprise how much more gas it took in the winter. More winter/summer difference than any other car I have owned.

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