79 Suzuki gs550 recommended oil

[Guest]

I have a 79 Suzuki gs550 and am from Canada. Can anyone recommend an oil to run in the motorcycle? The bike says it wants 10W-40 and it doesn't get overly hot here in the summer - usually between 20-30 Celsius (70 to 85 Fahrenheit) with falling more in the lower range of that. I've read about oil having a high zinc content. Any Canadians have an oil they love running? And where to purchase it? For what it's worth I currently have Castrol GTX in it.

[RichDesmond]

Any 10w-40 will be just fine.

[storm 64]

I run Shell Rotella diesel oil in my motorcycles now. Not the synthetic stuff! I use to run Castol GTX in all my engines years ago, but I think it was because I was a John Force fan. ��

[Cipher]

yes any modern oil will more than meet the spec your bike wanted when new
I use rotella something somethin cheap at walmart and works fine
so cheap I can drain it at will

as for it not getting very warm its not that it rarely does its that it might one day on a long haul

[Nessism]

I wouldn't run GTX. That stuff, like all auto oils, have drastically reduced ZDDP compared to back in the day. Get Shell Rotella instead. It's 15W-40 but GS bikes love the stuff.

[danbobberino]

Seems everyone is a fan of the Shell Rotella. I'll check it out!

[hannibal]

I have seen Rotella 10W-40 on Amazon. Seems more expensive than the 15W-40. Not sure if the content is different other than tbe weight.