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Old 10-11-2022, 03:17 PM   #1
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Mixing oils

I believe I know the answer to this...but I'll throw the question out there anyway.

Over time, and the course of oil changes, I've collected a few jugs. I've always liked Castrol, used to use their 10W-40 but can't hardly find it anymore, so I've been using 5W-40. These...



My question, probably obvious: Are there any issues, concerns, drawbacks or compromises associated with mixing these to use in my next (upcoming) oil change?

They're both Castrol synthetic 5W-40 weight oils. What's the difference? What exactly is "European Formula"?

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Old 10-12-2022, 05:44 AM   #2
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I've used both... regular Castrol syn and the "European" formula. Me? I wouldn't give a second thought to mixing the two. I can't imagine the specs are so different that the car is going to know you're mixing.

Just like Nancy said, "Just do it".

Oh, wait.
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Old 10-12-2022, 10:03 AM   #3
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Quote:
Originally Posted by Starter986 View Post
Just like Nancy said, "Just do it".
Uhh.. do you know Nancy as well..?
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Old 10-12-2022, 05:15 PM   #4
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I'm no oil expert but I will echo the other reply, I would have no worries mixing the two.

I'll expand on that by saying I would have no hesitation mixing two oils I would run on their own already. So if you would run either one of those oils anyways, then I say go for it.
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Old 10-13-2022, 08:52 AM   #5
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Quote:
Originally Posted by Gilles View Post
Uhh.. do you know Nancy as well..?
Lol. I didn't 'Just say no'.

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