
What Motor Oil is Best for Winter? (And Other Cold-Weather Questions) https://hrsynthetics.ca/ Synthetic oil is the best winter motor oil. We’re done here. If only it were that simple. But most people want empirical data to support such claims. Well, take a look at the video. We cooled a conventional 5W-30 motor oil and AMSOIL Signature Series 5W-30 Synthetic Motor Oil to -40º. As you can see, the conventional oil thickened so much that it barely flowed from the beaker. The AMSOIL product, on the other hand, flows almost immediately. Shop AMSOIL Synthetic Motor Oil Why the dramatic performance difference? In answering that question, I’ll also answer the question hoss61761 poses on social media: Conventional oils contain waxes that solidify when the temperature drops. This severely impairs the oil’s ability to flow when you crank your engine. In some cases, the oil can thicken so much that it prevents the crankshaft from spinning fast...