When I lived in Europe you could "feel" the difference between certain brands over others. Sometimes it was engine tone and sometimes a roughness at certain speeds.. These days I prefer Chevron regular over Shell, why, the machine feels better using it in my opinion! I have tried a lot of different fuels in over forty years of riding. I worked in a gas station for a while, I found it interesting the the one tanker would fill all three tanks using the same hose, just changing the gauge on the pump. Now remember that if they fill the regular tank first with a thousand litres of fuel and then go to fill the medium grade that there will be at least 80 to a 100 litres of regular fuel in the hose filling the medium grade and so on into the premium tank!
Now another point for your consideration, here in Canada, Pennzoil is usually the oil of choice used in servicing cars in many of the service bays in the western part of the province anyway. The tankers who deliver 5w30 and 10w30 come from the same tanker obviously but the pipe is just moved over to the next tank and after resetting the gauges the oil pumped through so the 10w30 is short changed in that the tank gets the 100 or so litres of 5w30 before the 10w30 finally is pumped in. 20 weight oil is usually delivered in 40 gallon drums (208 litres). All in all it doesn't really matter, your oil is changed to fresh oil and that's what's important right?
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