I changed the oil in my 8N Ford tractor yesterday. The tractor, like me is getting old and tired, it dosen't burn oil, but the oil pressure runs low. I don't use the tractor much anymore to justify an expensive overhaul. Which led me to try your oil additive, wow, the oil pressure jumped 10 psi and it seems to run alot better. I will continue to monitor the performance, but so far it's all good. Thanx.