Oil filter, double valve, documentary valve difference
You should be the Volkswagen Santana Santana Jetta oil price, generally these with a single valve, double valve is actually a layer of insurance,
when the filter clogging or oil pressure is too high, first open the first bypass valve, then also the normal filter.
Only a single valve and valve open after oil directly through the bypass valve flow into the engine, not completely filtered
So the general turbocharger uses dual valves because the turbocharger has a higher hydraulic pressure
