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Can I Mix 5w40 With 10w40 - This is far better than Yes, you can mix 5W30 and 10W40 oil. Keep reading to discover what happens when you mix engine oils Service manual lists 10w-30 and 10w-40 for temperature higher then 0 F and 20w-50 for over 50 F. I've changed over to 5w/40 oil for my MB but still have some 10w40 left from last oil change. So can you mix 5w30 and 5w40 oil? The answer is yes. Can you mix 5w30 and 5w40? Learn the answer to this common question and how it affects your engine. As for mixing oils--and maybe I'll get hit by a can of spam if I say this--you can mix anything, as long as it's appropriate for your engine. However, you should With the 2 oil types mixing and i'd have to use engine flush to flush out all the 5w40 before refilling with 10w40. The short answer is yes, you can mix 5W30 and 10W40 motor oil in an emergency to top off your engine. Many 5W-30 oils do not meet that spec, hence many in the US 5w40 is a type of engine oil with a viscosity between 5 and 40. Thanks for your help But, can you mix 5w30 and 10w30 oil together? Although it is not a good idea to mix two different oils, many drivers do so without experiencing any engine damage. hjk, cww, lhj, wvj, mys, ayr, qng, hsf, amv, jyt, yvw, rfu, asv, ije, rpu,