Thread: Mixing oils
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Old 05-14-2009, 03:51 AM   #1 (permalink)
Piwoslaw
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Svietlana II - '13 Peugeot 308SW e-HDI 6sp
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Mixing oils

Say I have 10W40 oil that's getting low and I need to add a bit. Can I add only 10W40, or can I add some 5W40 or 10W30? What will be the outcome? Will a mix of 10W40 and 10W30 be something like 10W35? Same for 10W40 and 5W40?

Also, what might happen if I suddenly switch from 10W40 to 5W30 or 0W30? Leaks?

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