Sooo.....i use bold engine oil for my kawaki ninja 250cc now.
After 1000km review.

Before i was using silkolene pro 4 fully synthetic 10w40. Use till 3k can feel a bit rough d especially during changing gears. Its rm46 per Litre.
Now using Bold fully synthetic 10w40 at rm15.90 per litre. Engine spec same ma2/sn.

When i pour in bold, i was a bit skeptical also la. First ride still feel rough when changing gears. But after 10km, smooth d. After 20km, pergghhhh the smoothness beats the silkolene and petronas F900 i put before.

Now at 1000km the smoothness maintain. For motorbike the engine oil is together with gear oil, so the smoothness very apparent especially during changing gears. Fuuuuuuuu, cheap n good.
But i read a few reviews say bold no good for their bike la. Engine rosak after use n whatnot. Thats why i takut takut a bit initially.
2L for bold = rm37.80
2L for silkolene = rm92
2L for petronas F900 = I think its around rm80-100 also, forgot d i bought at petrol station.

Jimat wei. Guna la bold dengan yakin. Sekian

I buy shopee. Maybe shopee cheaper or your shop chop chop u