On a shelf in my garage sits a truly shocking collection of oil filters ... oil pressure to lubricate your parts (i.e. you won't risk a "dry start"). The second interesting valve is the bypass ...

Oh, sure, no oil ... filter at a given oil pressure, viscosity, etc.), and some design/fabrication/materials issues. This last category might include what the bypass and anti-drainback valves ...

THE FRAM Ultra ... used with synthetic oil. Even though this filter is recommended for synthetic oil, it’s compatible with any oil type or viscosity. PTFE-coated bypass valves Great dirt holding ...

Brands include AC Delco, Bosch, Fram ... plastic valve at one end of the filter element with a spring that can be overcome by pressure. As the name implies, it causes the oil to bypass the ...