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Expert
185 Answers
- Posted on May 07, 2011
Re: Is 5/40 fully synthetic oil ok for top up for a mini...
Use whatever grade is printed in the user manual or on the oil cap. Synthetic and dinosaur oil can be interchanged as desired, but should not be intermixed. If you have high mileage, you could step up one grade. I.E OEM 5w/30, 120k miles you could use 5W/40.
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