I have a 1999 mod. E 240 V-6 with automatic trans.The car have a black cap, " Mercedes service only"I like measure the oil level in the transmision, and order a stick. Today I have it in my postbox. Part nr. W 140 589 15 21 00. I took of the black cap, and put in the new oil stick.But it is 30 cm to long? Are the new stick only for measuring? The oil level are between the marks, when the stick stops, but 30 cm remain before the stickhandle are in the oilpipe. Have I got a wrong stick, or what ?