Sewin ... that's exactly what I use on my wooden field gates ... served me well for years ... good black oil from the tractor engine was best 🙂
You can still get real creosote if you've got an agricultural holding ... at least you could last time I bought a drum.
New 'eco' stuff is ok, but not as good .... bit like modern adhesives that won't harm someone sniffing it but also don't do a great job of sticking things together like the bad old stuff 🙂
K