1986 300SDL & the Topsider....

Today I changed the oil in my newly acquired 1986 300SDL using the Topsider. Gotta love that easily-accessed oil filter! Only thing is, it didn't seem to get all the oil out like it did the first time I used it. First time was on my 85 300D and the oil was very hot. This time, the oil was hot but not as hot as the 300D's. Now that may be the reason, but I also noticed the dipstick tubing was angled down towards the bottom. Anyknow one if there's something going on down there that would impede the Topsider's performance? TIA.