Amsoil signature series & Castrol extended performance with engine guarantees. we test the full synthetic oils to show the evidence of bad engine oil. however the testing could show in fact the one oil doesn't equal up to its high quality claim. The oil in this video wasn't a bad batch or recall but just a good oil but not as good as the other oil. example the previous lawsuit against dollar general motor oil.
#Nia
Amsoil vs Castrol full synthetic engine oil!
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