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Yeah, I'm not sure the description they told me for why is very accurate. But more so, bigger is better for racing.
For my race cars I've always used the biggest WIX racing filter I can use.
I know the racing filters don't filter down to the small micron. But they don't bypass or restrict as easy. With a BBC drag motor, with a huge Hastings filter (non racing) I was visibly seeing a lot of metal in the oil. Oil was bedazzled sparkly. Using a huge WIX Racing filter, clear green oil (Brad Penn green stuff). So I know the filter makes a huge diff in racing. I thought I was doing great with what I thought was a real good filter... it was too good. Either a restriction or bypassing too much. I think for racing, it's not the microns you're worried about, it's the starvation or bypassing.
The sweet spot for my drag car turned out to be 15w50 semi synthic high zinc racing oil, and a huge Wix racing filter. Wear problems are gone with that combo.
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