Steaph Jeavons rode 80 k miles I think on her RTW trip without any engine issues on a Crf250.
I have an aquaintance in Thailand who last time I heard from him had 120 k kms on his Crf without engine issues.
I have a Crf250L standing in Thailand and it has close to 50 k kms on the clock without any engine issues. But I have noticed if I ride it hard (like 110-115 kms/h over long stretches) it burns a littlebit of oil. Keep it at 90-95 kms/h and its fine and doesnt burn any oil.
I think the key is how hard you ride it. To my ear at 90-95 km/h the engine sounds perfect. Above 100 km/h it starts to sound a bit uncomfortable and a bit buzzy. The 300 cc can probably be ridden a tad faster.
Oil change intervals is 12 k kms - but I tend to change at around half that distance. And sometimes even before if Im about to ride a longer trip.
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In the end everything will be fine. If its not fine its not the end....
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