Ok heres the issue had a used motor put in my truck. When you first start it up it runs great no knocking. I take it one about a 3 mile drive it starts knocking really bad. I just put new oil filter and 5-30 syn blend in it. Now another mechanic says to use conventional oil 5-30 because it is thicker.So now it will be third time in less than a week changing my oil does that seem right to you guys?he said same thing as me when it cold it runs great but after it warms up it knocks. Temp gauge is reading fine oil gauge seems fine too. too me it seems like its either heating up or not getting enough oil.
Are you a Ford F150 fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford F150 Fans to meet online. Once you join you'll be able to post messages, upload pictures of your truck, and have a great time with other Ford F150 fans. Whether your an old timer or just bought your F150 you'll find that F150Forum.com is a great community to join. Best of all it's totally free!
What engine is this? Have oil pressure read with a direct reading gauge. In general, if bearings are worn, knocking will be heard, only cure is to replace them. Do not forget about the oil pump pick up screen being sludged up.