Quote:
Originally Posted by Joon525
If I remember correctly it's because the threads of the valve itself stick up a little bit inside the pan.
Years ago on an LGT forum someone actually cut a notch in it so more drained out.
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Yep. Guys do all kinds of things to get that last bit out. Notch the bottom, drill a hole, grind some threads off jack or ramp on one side to tip the car... The press formed thread insert also protrudes into the pan + 3/8". So even without the Fumoto, you're leaving a good bit in there. More than a cup, but probably not two?
Glad to see the New WRX FA24's pan has a better boss that's extended outward. Looks to have machined threads (vs formed) and there are more threads as well.
WRX top left, BRZ on the right...
How much of this really matters? Probably very little since at an oil change, you have almost a quart suspended in various places in the engine anyway. Just another reason to be vigilant with oil changes.
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