#1
★ Top Pick
Yamaha Yamalube 10W-30 4-Stroke Engine Oil- 1 Quart, #LUB-10W30-FC-12
Yamalube 10W-30 is a natural match for the FZ25's 249cc air-cooled single-cylinder engine, which runs warm and benefits from the moderate viscosity that keeps oil film stable under stop-and-go city riding. The 10W-30 rating aligns with Yamaha's own factory recommendation for this engine, and buying OEM oil removes any guesswork about additive compatibility. One honest caveat: at one quart per bottle, you'll likely need two for a full oil change plus a little leftover.
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