Burning 8x or higher rated media on a 4x burner?

I have almost finished my old supply of 4x Taiyo Yuden dvd-r discs.

I am going to order myself a new 16x writer and some 8x Taiyo Yuden dvd-r’s soon.

My question is, will the 8x media be ok to use on my Sony DRU-500AX 4x burner??

Will it be a similar case to the 1x/2x recorders not being able to burn properly using 4x media without a firmware update OR should I be ok with the 8x (or higher) discs in the 4x burner?

I would rather not have to buy 4x media just to be able to use the Sony (giving this to my brother to use).

Nobody have any idea about this?

Should be fine, I had a Pioneer 105 4x burner and 8x rated Fuji discs were okay on it, it just burnt them 4x as normal.