semi

I used fully synthetic oil on my 6k service. Just wondering if I can use semi synthetic oil on my next change or do I have to use fully synth every time once fully is used? Thanks. Sorry if this has been asked before but I couldn't find what I was looking for in search.

We used these twice last year so nearly new. Includes locks, inner bags mounting frames and all fixings. They are actually better than people make out but we (well she) needed more space for this years trips so I have bought a set of Givi. Not sure about filtering in traffic any more as they...