[Kurt in NJ]

The A dipstick hole is too small to be efficient.
I have used that method a lot on Mercedes because they were designed for it and most had the oil filter accessible from the top
the dipstick tube is about 3/8 on the benz and would suck out the 8 quarts in about 5 minutes when hot.
sucking out transmission fluid or engine oil with a 1/8 inside diameter tube could take more than 30 minutes with a air powered pump