well since nitrogen is a component of crude oil i would assume it all had some nitrogen content to it!LOL,I am not a big fan of shell,but they do have good gas.around here at least nearly everyone else get their fuel from the same truck ,it simply goes from station to station regardless of brand or station logo.Shell at least has their own delivery system to their stations so it at least makes their claims a little more believable( they may come from the same refinery ,i cant say).I dont buy shell gas because its higher and theres not one really close.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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