Originally Posted by northernfarmer
Just bought a 04 F150 FX4 with the 5.4.....as it was used I've been getting everything serviced so I know where I stand with it...Took it in and got the oil changed.....I farm and use 0-40 synthetic in everything...from my push mower up to my 450 hp 4 wheel drive tractor.... I put the 0-40 into the 5.4...and now I see that it is recommended to use 5-25....Any oil experts know if I'm fine or should I be changing the 0-40 out.. I change the oil in my cars and trucks every 6000 miles.....Thanks for the help
I like the 0w40. Mercedes recomends it in ALOT of their vehicles. Plus being up north it will be better for you. Change your oil every 5000 miles with synthetic. I dont care what anyone says. BMW, VW and Mercedes went to 10,000 mile oil services and have had to replace ALOT of engines because of it. VW went back to 5000 mile changes. Mercedes still has 10,000 mile changes but the dealerships will (under the table) tell you 5000. BMW revamped their oil, which is made by Castrol, so it lasts longer supposedly. We still recomend 5000 mile changes with it. IF you go over 5000 miles even with Super synthetic neverbreaks down because we tell you it wont so we can sell you our brand of oil. Ford will void your warranty because that is not what they recommend.
They will not void it because of the weight but the mileage between changes. I Just looked at my 02 Ranger owners man. and they recommend 5000. I think my 05 f150 is the same.