Oil change

Does anyone know if it is alright to use semi synthetic oil after using fully synthetic?

No problem at all

Years ago there used to be issues going from a fully S, down to a semi S (sometimes) and or back to mineral (sometimes) due to the seal swell rate but thats all history now. You can even mix mineral with semi with full S if you want to without an issue at all

Do as you fancy Ray

I just changed so semi synth and there is no issue with it

Just about sums it up nothing more to add, from me at least

Thanks guys.