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oil rating on 2003 Mazda Miata MX-5

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What is the best oil rating for my 2003 mazda miata
(1) Answer
The manual says use oil with an API Service “SG, SH, SJ,SL”. If your ambient temperatures are between -15F and +115F either SAE 5W-30 or SAE 10W-30 is acceptable. If you don’t have the owners manual and would like one you can download it free here:
http://www.autousermanual.com/view/mazda/mx-5-miata/