[l1driver]

I have had the truck for 10 years. It had 86,000 on it when I bought it. I've run only Amsoil 5w30 per Manufacturer spec. I use an Amsoil filter and change the oil every 5,000 miles. Oil pressure has always been 50-60. I got the truck through an auction and have no service info or any idea what it was used for. It came with a factory tow package but that's all I really know. The mechanic who does all my work for me suggested going to a Higher viscosity oil. He said he had a similar issue with his Expedition and it helped quite a bit. Having the oil changed in a couple days.