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I just did my oil change and maybe I am just getting old and "C" nile but when you loosen up the filter housing cap I swore there was a spring that popped the cap up once it was completely unscrewed. Am I correct or just loosing it? I called the dealership and they could not find one (thought I lost it) so know I am scratching my dome.
That spring effect was the drain back valve in the filter housing. When you lift the filter a drain valve opens letting the oil in the filter housing drain into the oil pan. When you install a new filter and screw the cap down it closes the spring loaded valve. Lube the O ring with oil, snap the filter into the cap and screw down till the cap bottoms out. Then torque to spec.
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