Thread: Any advice on oil weight

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Multi-viscosity oils are formulated to emulate the properties of thinner oil when cold and thicker when hot. A 5W-30 has a viscosity of 5 weight cold, and of 30 weight when hot. The newer 5W oils were formulated for better economy (less drag) in tighter engines to improve efficiency. You should see no difference in your operating pressure between 5W-30 and 10W-30 as they are both 30 weight hot. You might try 10W-40 for one cycle and see it that gives you any better hot pressures.

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