I'm sure this has been covered but I can't find it using my phone lol and if this forum is like any other then the oil threads are always fun but...

Back story:
I just bought a new to me 2010 F150 xlt 4x4 with the 4.6L (167,000 miles), I was supposed to pick it up 2 weeks ago but the dealer said it needed cam phasers and timing chains. I waited an extra 3 days so they can fix it, picked it up Wednesday the 16th, drove it until Saturday the 19th, got over to a buddies house to show him the new truck and when I went to leave it was making the worst sound ever and check engine light on. It was the cam phasers that were just changed. I towed it to the dealer and they have had it ever since.

I am looking forward to getting my truck back but in the mean time I was told to change to 5w 30 from the 5w 20. I see all over one person will suggest it then another person says no. Also everything I read is old and pre 2010. So what is best for the truck? I live in the Midwest, don't tow anything, not really hard on the truck

 

 

I'd say why not listen to your dealer but it looks like they might not be much help. Seems like you might have just bought a source of constant sorrow.

 

yeah I don't have much faith in the dealer since it is a Buick/GMC dealer. They have been working on it for over a week now. I wish they would send it to ford and let them do it but they said their mechanic is good

 

What logical explanation do you have for not using what Ford recommends? Ford designed, tested and built the engine. They also work with the suppliers for engine components that are built using the specifications that Ford gave them. One of those specifications was the 5W20 oil requirement. If oil passages and the oil pump are designed for lighter weight oil then a thicker oil will not flow as well. Engines tolerances are getting tighter which requires a thinner oil for adequate flow. The most logical choice is to use what the engine was designed to use, 5W20.

The oil viscosity is not what usually caused the cam system failures on those old Triton engines, poor maintenance is usually the culprit. Those engines are not tolerant of a lack of maintenance (especially the 3V engines) and are not designed for extended oil change intervals. My cousin has a 2006 F-150 XL with over 230,000 miles on the 4.6 engine. He doesn't baby it but he does change the oil every 5,000 miles and only uses Motorcraft filters. He has not had any engine problems, although it is the less powerful but more reliable 2V engine. I also think that pushing and engine hard is good for the engine. That 4.6 in his truck is not exactly powerful so WOT is needed in everyday driving like merging on the interstate. I believe the more you baby an engine the more problems you will have. Opening it up and pushing oil pressure to the max may help prevent small particles or sludge building up in the VCT system by forcing any contaminants out.

 

 

I was told my a ford engineer in Dearborn to switch too 5W30 in my 5.0 f150. And have ever since. They actually call for 5w30 in other countries with our motors. But something having to do with our emissions they say 5w20.

 

 

Cam phasers? Dealer had my new truck 17 days, I just picked it up and as soon as I pulled in the driveway truck rattling engine light on. Needless to say its back at the dealer
https://youtu.be/0Vs44NahWHY

 

Your Youtube link currently shows "video is unavailable". Would it be possible for you to re-upload it and post the new link here? Thank you.