was bought ages ago, not intended for my car as i don't need a service yet.
just thought i might use it since it was lying around.
If you can't sell it or exchange it. You could consider mixing.
Go to Autobarn, grab a bottle of Mobil 1 5W30 silver bottle silver cap, then do a 50% 5W30 and 50% Mobil 1 5W50 for your next oil change. That will result in a viscosity around 5W40. All Mobil 1 are compatible.
In terms of the method of mixing, there are brands, viscosity and proportion one would try. However, a case of mixing Mobil 1 and 50% proportion is as safe as you will get using the mixing method. Going further than this, most people get more misses than hits meaning not getting a good result.
BTW, I run full synth 15w50 in my 13:1 comp 12,000rpm dirtbike, and I can't tell the difference between 15w50 and 10w40, besides the 15w50 seems to last longer.
Can't go wrong with Honda FEO 10w-30 Mineral but you have to buy the bottle yourself. I don't know of ANY honda dealer that uses FEO oil as their regular service oil as they buy drums of Shell helix.. Magnatec etc. It's interesting that it's very hard to find another mineral 10w-30 engine oil.
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