"Amagill, whats the difference between a full wash and oil and a top up?"
We lay the house pattern down every second day with a wash & oil. The days in between when we "top up", all that is done is add oil to the middle of the pattern that was laid down the day before...
eg; I think, from memory, our house pattern at the time was approx. 38-39ft long. The pattern was a typical x-mas tree, starting at 2-2, then 5-5, 7-7, 9-9, etc, etc... Total oil volume wass roughly around 20mls... The "top up" or "fill" pattern was much simpler, it simply laid a strip of oil right down the middle of the x-mas tree & total oil volume was around 15mls... Also, it only oiled to about 25ft down the lane...
This saved heaps of $$$ on the amount of lane conditioner we were going through, as well as wear & tear on the kegel... The fill pattern was still quite playable, though the shot was fairly different to the normal house shot...