Engine getting louder
Cargo Master
Joined: Aug 2010
Posts: 3,220
Likes: 62
I haven't changed the oil yet (3800 miles now) I frequently here the engine change it's pitch.
Sometimes nice and quite sometimes like an older model.
Don't know if it is possible but almost sounds like the pilot injection is turning on and off.
Sometimes nice and quite sometimes like an older model.
Don't know if it is possible but almost sounds like the pilot injection is turning on and off.
Post Fiend
Joined: Apr 2004
Posts: 5,158
Likes: 35
From: North of Salt Lake City
It does the same thing on mine too. Like you said, sometimes it seems almost as if the pilot injection is turned off. In a couple of cases, a DPF regen started within a minute of the increased engine noise. Seems like it changes from 4-5 injections per cycle to 2 per cycle. There's no way that is accidental. I'm sure this is just part of the software strategy. For some reason the injection strategy changes right before the regen begins.
Laughing Gas
Joined: Aug 2010
Posts: 852
Likes: 12
From: Kentucky
It does the same thing on mine too. Like you said, sometimes it seems almost as if the pilot injection is turned off. In a couple of cases, a DPF regen started within a minute of the increased engine noise. Seems like it changes from 4-5 injections per cycle to 2 per cycle. There's no way that is accidental. I'm sure this is just part of the software strategy. For some reason the injection strategy changes right before the regen begins.
Posting Guru
Joined: Nov 2010
Posts: 1,783
Likes: 1
From: WY
Yepr. A little bit louder after the first transfusion. Dealer warned me it would be because of the additive FOMOCO puts in em before they leave the mothership. I pay almost $4 agallon to hear that rattle. I like it!
Lead Driver
Joined: Feb 2005
Posts: 7,906
Likes: 2,625
From: The Great State of Texas
Senior User
Joined: Apr 2003
Posts: 100
Likes: 0
From: Calgary,Canada
My dually has started to do the same thing. Runs tight and quite, then changes to a 6.0L. More 6.0L than tight and quite lately - and thats the part that I don't like. Why start changing after a couple thousand miles?? Also seems to lose throttle response when it running like s**t as well. I really don't think that its normal.
Should run the same all the time, this isn't 1973 here.
Should run the same all the time, this isn't 1973 here.
Posting Guru
Joined: Nov 2010
Posts: 1,783
Likes: 1
From: WY
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Posting Guru
Joined: Nov 2010
Posts: 1,783
Likes: 1
From: WY
Lead Driver
Joined: Jan 2010
Posts: 6,600
Likes: 83
API CJ4 according to the data sheet.
Mobil 1 Turbo Diesel Truck 5W-40
Mountain Pass
Joined: Mar 2009
Posts: 191
Likes: 60
From: Ca Wine country
The oil viscosity should have no effect on combustion related noise as the 6.7 does not use the oil in the injection system. It uses low pressure bleed fuel for the hydraulic portion of the injector.
Mines only at 2500 mi. but I might change the oil to see if it will talk a little more, I miss the personality.
Mines only at 2500 mi. but I might change the oil to see if it will talk a little more, I miss the personality.
Posting Guru
Joined: Nov 2010
Posts: 1,783
Likes: 1
From: WY
I have never used it but here it is.
API CJ4 according to the data sheet.
Mobil 1 Turbo Diesel Truck 5W-40
API CJ4 according to the data sheet.
Mobil 1 Turbo Diesel Truck 5W-40
I'll have to see how much it costs and the availability in my area. I like choices.
Is it true that after using a synthetic oil, you can't go back to dino oils?
More Turbo
Joined: Jun 2003
Posts: 610
Likes: 3
I remember my 6.0 was the same way. Quietest I ever heard when I bought it, almost the same as my 7.3s when I sold it at 45,000 miles. My 6.7L engine does seem a bit louder then when I bought it (at 7500 miles) and I pretty much figured it will get louder as it gets older.
Freshman User
Joined: Mar 2011
Posts: 49
Likes: 0
Mobil just started to make the oil, this is what I was told anyway by the supplier. It was only avalable in quarts when I bought it, $32 for a six pack. I will be getting a drum as soon as they are avalible. It does have the CJ-4 rating.
Cargo Master
Joined: Aug 2010
Posts: 3,220
Likes: 62
On the Amazon site 2-1 gallon jugs for $57.00.
Works out to 7.12 a quart.
I have an Amazon prime account which gives me 2nd day free shipping.
Thast good - no tax, no shipping, no Hazmat fee.
Amazon.com: Mobil 1 44999 5w40 Turbo Diesel Truck - 1 gallon, Pack of 2: Automotive
Works out to 7.12 a quart.
I have an Amazon prime account which gives me 2nd day free shipping.
Thast good - no tax, no shipping, no Hazmat fee.
Amazon.com: Mobil 1 44999 5w40 Turbo Diesel Truck - 1 gallon, Pack of 2: Automotive