Normal FEO oil is semi-synthetic and should be changed every 5000km.
Cost of using dino or 5000km oil change intervals over a year.
$40 x 2 (oil) + cost of intermediate oil change and 'minor service' - $100.
Cost of using fully synthetic oil (e.g. Mobil 1 Gold) $80 which is the same as two bottles of cheaper oil. And you don't have to pay for a 5000km oil change as the interval becomes the routine 10000km / 6 month service.
That's why I don't use Shell Helix etc...
I see no problems with changing at 10000km rather than more frequently if you're using a good fully synthetic or better yet - ester oil. Motul 300V is a bit excessive unless you're a doing track work but there are plenty of cheaper and really good oils around.
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