5.0 coyote 5w-30 vs 5w-20
Thread Starter
Junior Member
Joined: Oct 2014
Posts: 4
Likes: 0
5.0 coyote 5w-30 vs 5w-20
Anyone else using 30 weight oil instead of the water thin 20? I use mobil 1 5w-30 in my coyote because I'm an experienced mechanic and can't see 20 weight possibly offering the protection of 30. It's been said the only reason manufacturers are recommending 5w-20 and 0w-20 is simply to improve corporate average fuel economy In order to meet government standards. I would say this is true. What's Also intresting is ford recommends 5w-50 in the track pack mustang which has the exact same engine as the GT which calls for 20 weight. I'm just curious what your all thoughts on this are??
Popular Reply
Jan 5, 2015, 11:39 AM
Senior Member
Joined: Feb 2014
Posts: 1,164
Likes: 161
From: Ardmore Alberta
This is such bullsh!t... stop it. Do you even know what "tight tolerances" they mean... no you don't... It's not that the rod bearings, mains and piston to wall are that much tighter. ... they aren't. What it means is manufacturing wise they are supposed to be more uniformly built from better equipment with more repeatability. Because of those supposed requirements you can run water consistency oil and still be blessed to build oil pressure. They tightened up their tolerance to error... You need clearance regardless to deal with with thermal expansion... that hasn't made engines suddenly need zero clearance between a bearing and a journal. Engines built 35 years ago can easily be machined with the same physical tolerances but magically they are okay to run with higher viscosity oils.... nope! The only argument I have ever seen that may present some validity is the cam phasers because depending on design oil pressure advances and retards the cam or cams. If it changes ant amount it throws the process out..... but that's it. Enough with this tight tolerance rubbish already!
Senior Member
Joined: Aug 2014
Posts: 723
Likes: 110
From: Texas
I run 5w-30 amsoil in my 13 5.0 without ill effect. One thing i dis notice was when i switched to an amsoil oil filter was a slight clatter noise when it is cold. It goes away after the engine warms up but just started when i switched filters.
5 Year Member
Joined: Apr 2013
Posts: 6,135
Likes: 885
From: New Orleans, LA
Ford says to run 5W-20, that's what I run!
MotorCraft Syn Blend and MotorCraft Filter ONLY!
Pulled my 5.4L apart at 98K miles after using only Motorcraft 5W-20 Oil and MotorCraft Filter and it looked brand new! Not a single sign of wire. The cylinder walls still had honing marks on them!
Wayne
MotorCraft Syn Blend and MotorCraft Filter ONLY!
Pulled my 5.4L apart at 98K miles after using only Motorcraft 5W-20 Oil and MotorCraft Filter and it looked brand new! Not a single sign of wire. The cylinder walls still had honing marks on them!
Wayne
Senior Member
Joined: Jan 2014
Posts: 4,100
Likes: 359
From: Ohio
Ford says to run 5W-20, that's what I run! MotorCraft Syn Blend and MotorCraft Filter ONLY! Pulled my 5.4L apart at 98K miles after using only Motorcraft 5W-20 Oil and MotorCraft Filter and it looked brand new! Not a single sign of wire. The cylinder walls still had honing marks on them! Wayne
Junior Member
Joined: Nov 2014
Posts: 21
Likes: 7
From: Canada
Last edited by Big Blu; Jan 4, 2015 at 06:32 PM. Reason: Disco
Trending Topics
5 Year Member
Joined: Apr 2013
Posts: 6,135
Likes: 885
From: New Orleans, LA
Senior Member
Joined: Nov 2010
Posts: 11,854
Likes: 2,559
From: Timbuk3, MI
After changing-out the OEM oil at 750 miles, I've used 5W30 convential oil (Pennzoil) since. Now has 29,000 miles and there's been no issues.
BlackStone Oil Analysis - 21,760 miles ллл -click-
Followed the same regiment with my 2003 Crown Victoria LX Sport (currently has 120,000 miles).BlackStone Oil Analysis - 103,696 miles ллл -click-
Senior Member
Joined: Feb 2014
Posts: 1,164
Likes: 161
From: Ardmore Alberta
It's oil people... it's a lubricant and a coolant... You could run 15w50 provided it wasn't cold out and have zero issues too. 5w20 offers adequate protection while supposedly increasing fuel economy. ... that's it. Pretty well all manufacturers switched for this very reason. Any good oil filter should have an anti drain back valve. I noticed startup clatter when I tried an amsoil filter... swapped in a Motorcraft and it's significantly improved. Motorcraft it is.
