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I couldn't get any of the Castrol TWS 10W-60 locally, the guy a parts store told me to buy Mobil1 'European Car Formula' 0W-40 and said it would be fine to add to the existing TWS 10W-60. I just need to add 1Qt for short term, then I'm getting a full change soon. Is this OK to add? It feels wrong adding something that is not the intended formula, I don't trust the guy and need to crowed source this answer from you guys. What is the census?
 

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10w-40 or 0w-40?

Just use SAE 10w-40
 
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