oil filtersWe want to continue to discuss oil changes in your  GMC Trucks near Thunder Bay, as we began our research and discussion on behalf of your Thunder Bay GMC Trucks Service in ON and left off before getting into the nitty gritty of the filters involved.  “In operation, oil enters the oil filter through a series of small holes on the outer edge of the base flange. The oil is then directed through the filter, eventually making an exit into the engine through the large center hole. Most modern oil filters are equipped with an anti-drainback valve.”

Typically this valve is a membrane of rubber that covers the outer holes in the base flange and the membrane is pushed to the side as oil enters the filter case.  According to our research on behalf of your GMC Truck Service in Thunder Bay, the following is true, “When the engine is not running, the rubber membrane covers the holes. Obviously, the anti-drainback valves maintain oil within the filter. In turn, they prevent engine dry starts (when the engine is started with no oil).”

Interestingly enough, oil filters have changed for GMC Trucks in Thunder Bay ON over the years and the early ones were totally based on a replaceable element that was housed inside a metal concoction.  We read online that “When changing the filter, one removed the housing, discarded the element, cleaned the housing, added a new filter and re-installed the assembly to the engine. By the mid-20th century, spin-on filters gained popularity. Here, the filter element and the cartridge are self-contained.”  From what we have read in our research on behalf of your Thunder Bay GMC Trucks Dealer in Canada, you can easily remove the whole shebang now and throw it away, then screw on a new filter when changing the oil.