Spin-on filter in my car installs straight up, so I can fill it all the way before I screw it on. Only the galleries need to purge before oil pressure can build. Since I just installed an electronic oil pressure gauge that updates a few times per second, I decided to record what the pressure does on the first startup at my most recent oil change. I used 10w-30 Valvoline Full Synthetic with Maxlife Technology and a Mann W917 filter.
It will be a while before my next oil change, but when that happens I'll do an experiment. I'll use the same oil and filter, but this time I will only put a splash of oil in the filter instead of filling it to the brim with about 1/2 quart. Be interesting to see how much longer it takes to build pressure.
It will be a while before my next oil change, but when that happens I'll do an experiment. I'll use the same oil and filter, but this time I will only put a splash of oil in the filter instead of filling it to the brim with about 1/2 quart. Be interesting to see how much longer it takes to build pressure.