the red thing is called a locking pin and can be removed with a flat head screw driver. I bought 5 of them just in case I break them (very cheap), and I also have the dip stick (140 589 15 21 00), make sure your engine is hot when you check the oil level. 80 degrees celsius and it should be in the middle of the min and max mark. but as gilly said, transmisison fluid changes are not required..

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