Hey.
Yeah back in the ole day ppl would use old sump oil but that is illegal now so we used vegetable oil. It smelt like hot chips for months but the grip was INCREDIBLE!! and it last ages.
We always had one problem with our track and that was that it was too slippery. and because RC isn't huge here we couldn't get it to blue groove either.
I will see if i can dig up some pics of tracks here.
Glenn