How long and how much is the diesel Harvard school oil pump?

That depends on where you drive. You can drive in the south, but it's not easy to light a fire in the north. I suggest you buy gasoline, because most of the domestic diesel oil is unqualified, and there are too many dregs, which will accelerate the wear and tear of the plunger and nozzle of high-pressure pump. Although the gasoline car consumes less fuel, it is comfortable to drive and has little noise. Domestic diesel vehicles (such as diesel Jetta) will be like tractors after a few years of driving.