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Discussion Starter #1
Mechanic says we have a VERY slow fluid leak.... and just to watch it... When I pull the dip stick it says "no need to replace under normal driving condition - fluid is different for 4WD see owners manual" NOTHING about the transmission fluid is listed ANYWHERE in the manual or that I can find online.
 

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Your 2008 AWD van uses a U151F transmission. The transmission and basic differential section uses Toyota Type WS fluid. The AWD transfer case attached to the transmission uses gear oil (90 weight?).

Where did he say the leak is? Which fluid is leaking?

One thing comes to mind: There was a TSB related to a seal issue that can allow ATF to get into the transfer case. Then either ATF or gear oil is forced out of a vent on the transfer case.
 

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We actually asked about it because we had been told in the past there "seemed" to be a slow leak.... It was a toyota specialist mech and he mentioned the seal issue also - AND it was found on the case so that could very well be it.

Your 2008 AWD van uses a U151F transmission. The transmission and basic differential section uses Toyota Type WS fluid. The AWD transfer case attached to the transmission uses gear oil (90 weight?).

Where did he say the leak is? Which fluid is leaking?

One thing comes to mind: There was a TSB related to a seal issue that can allow ATF to get into the transfer case. Then either ATF or gear oil is forced out of a vent on the transfer case.
 

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I'm not sure if this is the very final revision, but it'll give you a taste for what's going on. Applies to Sienna, Highlander & RAV4 plus some Lexus applications. Google T-SB-0138-10
 
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