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In this video I show the tests carried out with Yamalube 20W 50 oil. I rode 3 thousand km with the CBX 250 twister and every 500 km I took a sample of the oil and did the test on the viscometer. Always using the Brazilian standard NBR 10 441. # motorcycles # mineral oil # yamalube 20W 50 # motul oil 20W 50. # ipiranga oil 20W 50. # viscosity in lubricating oils. # motorcycle oil. # oil for motorcycles.