October 2009 Issue
Oil Filter Rejoinder: Tempest Takes Issue
We picked Champion as our top choice in filters, but Tempest says not so fast. The company says we overlooked some critical features in Tempest filters.
In our review of oil filters in the August 2009 issue, we picked Championís line as the best overall choice in a field where both Tempest and Kelly Aerospace offer competitive products. Tempest wrote us this month to contest our findings, contending that our research glossed over some key technical advantages of Tempest filters. What follows is a summary of Tempestís response. First, the filter bypass valve. Tempest says we overlooked what it argues is the "biggest safety enhancement made in spin-on oil filters in years." Specifically, says Tempest, is its safety containment cap surrounding the bypass valve. Bypass valves have been known to disintegrate at the spot welds, spewing bits of the valve into the engine or blocking the filter outlet hole, starving the engine of oil. Tempest says its containment cup will eliminate this problem. "Additionally," says the company, "the absence of a gasket under the valve eliminates the potential for leakage."
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