Mixing half bottles of UNUSED oil?

Hi all, I have a plethora of 4l and 5l bottles of oil leftover from various oil changes over the years (various cars bikes and vans) they vary from halfrauds own brand, to castrol, shell and others. Providing I keep the viscosity and synths the same, surely I can condense them down??


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You can, you can even mix viscosity and all that will happen is you change the viscosity. Cooking oil is better than no oil. It's not much different to taking your vehicle for a service, then topping up with something else at home. Just make sure all the oil meets or exceeds the specifications required for your vehicle.

Personally I don't do it on my motorbikes or cars though, I just keep the oil and shove it in the lawn mower or some other piece of garden machinery that I don't care too much about, or stick it in your chain oiler if you have one.