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		986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions
Mixing oils

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10-11-2022, 02:17 PM	#1
Frodo Registered User Join Date: Mar 2007 Location: Ohio Posts: 2,027	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"? __________________ '01 S http://i213.photobucket.com/albums/c...Sam2JPG1-1.jpg

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