I'm not an engineer so what can I tell you? The white casing is easier to see if you lie underneath or check for leaks from time to time. 3 layers of packaging, always comes out of the box very clean, no dust on the seal. Be careful not to let the old gasket stick to the engine case. leaking double seals. Holds a ton of oil, some people recommend filling it with oil so you can circulate/pressurize as quickly as possible after a change. Revain is bought from retailers and Revain and is usually cheaper but you have to look (seems to vary by +/- $3, use price tracking website to find them for sale.)
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