Fully synthetic oil used,next change can I revert to semi synthetic

[wales2wheeler]

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.

 

[robbo67]

I thought this was the case but did extensive googling and it is no longer an issue. You should be fine.

 

[wales2wheeler]

Thanks for your speedy response. I tried googling but could not find anything confirming yes or no, appreciated.

 

[robbo67]

I just searched against "mixing semi synthetic and fully synthetic oil" and one of the answers was: "Mobil 1 is fully compatible with conventional engine oils, semi-synthetic engine oils and other synthetic engine oils if you need to mix them. However, it is important to note that the superior performance of Mobil 1 will be reduced by diluting it in any way."