2001 Ranger Duratec DOHC 16 Valve. Specs 5w20. I have Amsoil Signature Series 5w20 in the Ranger now and absolutely no plans to go back to Redline. The reason is not the Redline UOA results, but oil pressure.
I installed an oil pressure gauge in October 2012. I was suprised at how high the pressure ran cold. I documented on cold start at 30F in the morning, Cold pressure went right up to 95 psi, then wen I took off it increased with rpm to 110+.
I wondered if the Amsoil (or other 5w20) would lower the pressure since the Redline 5w20 has an HTHS viscosity of a 30 weight. Well the weather was running too warm to confirm. However, it got fairly cold over the weekend and this morning when I fired it up it was just over 30F. Here are the pressures now with Amsoil: 30F cold fireup: 85 psi. Taking off with increasing rpm: 95 psi.
I also noticed that the pressure came down towards normal faster. By the time I was ready to hit the freeway (1 mile) it was idling at 50-60 psi. Before it was still at 85. Idle pressure is basically unchanged.
I have to conclude that the Redline 5w20 is not a well balanced (physically) oil for my particular engine.
I installed an oil pressure gauge in October 2012. I was suprised at how high the pressure ran cold. I documented on cold start at 30F in the morning, Cold pressure went right up to 95 psi, then wen I took off it increased with rpm to 110+.
I wondered if the Amsoil (or other 5w20) would lower the pressure since the Redline 5w20 has an HTHS viscosity of a 30 weight. Well the weather was running too warm to confirm. However, it got fairly cold over the weekend and this morning when I fired it up it was just over 30F. Here are the pressures now with Amsoil: 30F cold fireup: 85 psi. Taking off with increasing rpm: 95 psi.
I also noticed that the pressure came down towards normal faster. By the time I was ready to hit the freeway (1 mile) it was idling at 50-60 psi. Before it was still at 85. Idle pressure is basically unchanged.
I have to conclude that the Redline 5w20 is not a well balanced (physically) oil for my particular engine.