Having owned machines both ways here is what I can tell you. The biggest advantage to 0 degree's is the water savings. As far as cleaning not so much. Volume seems to clean better and your inverted L with v jets has more volume than the 0 degrees which equals better cleaning. Now another important note is the fact that in order to run 0 degrees on any machine you will need a seperate nozzle manifold for LP presoak as the current setup delivers presoak through regular v jets along with high pressure rinse because you cannot run presoak through 0 degree nozzles. I have experimented with 2 manifolds on a 4000 arm adding the additional manifold to the side of the current and using it strickly for low pressure chemical delivery along with my own way of diverting the low pressure to only exit through the new manifold and nozzles and not the old, and then when high pressure kicks on the reverse takes place where the high pressure only exits the old manifold and not the new one. After all this extensive research I will tell you the 0 degrees are not effective enough as far away as they are from the vehicle, they need to be 1 or 2 inches off surface to really see a difference. The best overall setup are the ceramic inserted v jets, they last 25 times longer than reg stainless v jets. Getting back to 0 degree's though they didnt seem to create much trouble as far as maintenance goes, you can put a rebuild kit it them but out of the 5 or 6 kinds I have tried not one really stood out as better than the other. Always goes back to this, a 5gpm x 1500psi pressure washer cleans /works better than a 2.2gpm at 2500psi, atleast this is my experience when cleaning heavy machinery and equipment which always goes back to Volume outperforms pressure, but volume costs more also so its a balancing act. In order to get a machine to perform with 0 degrees you have to compensate with much stronger chemical so the cost is balanced out with more chemical and less water, or more water and less chemical. This is my conclusion on the whole matter anyway.
