How many filters are there in the portable oil filter? What's the difference?
Three is the three filter in parallel, and the four is the 4 filter, in turn, but double two start, each filter precision is different, this should be based on the filter medium to decide.
The primary filter can also be called a portable oil filter, which is a simple filter core to filter the impurities, and the two stage is the two filter core
The portable oil filter has primary, two, three, four, five, six and eight filtration
