I have a 2006 GS300 RWD, and I do not have the nut on the end. I recently purchased this vehicle, and I decided to change the oil myself because after I had the oil changed at the dealer, I noticed that they overfilled the oil and it looked dirty. I was surprised that my vehicle did not have the nut on the end of the filter. anyway I read somewhere that the GS350 did not have the nut, and you have to align the tabs on the canister body to drain the oil from the filter. I used a regular filter wrench and successfully changed my oil. I am now using Castrol Edge syn, and it is at the right level and clean.