Bullsco

I pay attention to the ambient or outside temperature for the oil viscosity I choose. If it's cooler say -10 to 15*C then I stay with the 10w40. The next stage would be from around 15*C to 21*C when I switch to 15w40. When it stays consistently warm above that I stick with the 20w50.... It seems to work well, good protection and minimal engine noise.

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06 C50, Royal Purple full synth, K&N filter, 82000 kms (51000 mi), NC shield & bags. MC sissy bar, pillion seat levelled, rear peg swap, reversed saddlebag mounts.

"Live, don't just exist, learn from your mistakes and those of others, don't just go through the motions of life for it's too short and precious. Everything you do, embrace it, live it to the fullest extent." ... anonymous

DCinCT

GTX regular 10/40 or 20/50...like i said...has worked fine for me for the last 80k miles I've used it on my 2 suzuki's.

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Whats the big hurry...slow down and enjoy the ride!

dfinitlydisturbd

It's like $9 and change with tax here, compared to $5 no name wallyworld dinosaur oil yeah it's expensive but for a synthetic it's middle of the road at worst on the cheaper end of thing on average.