Engines come
On type 1 & 2 the filter oft only filters the oil which is already in the sump
Thanks. Does that mean that the filter really doesn't do much; ie, mostly for show?
It removes debris from the oil
A lot more than most would believe.
Fill a new filter with oil & weigh it
Then do the same when it comes off.
The difference is all of the crud it has removed from the oil