anywhere between 40/1 50/1 with good gas and synthetic oil is where I run my bike fleet. (01 gasgas EC 300,03 KX 125,97 RT 180, 98 RT 100) I adjust within that range with the conditions that we ride and the stress the we will be putting on the engines. In my mind 32/1 is only good if you make sparkplugs or muffler packing for a living!! The new generation of oils are SO much better than they were even 10 yr's ago. If you want to help make your engine last spend most of your efforts in keeping your air filter clean and in good shape!