Loss of power/mpgs after oil change
05-11-2016, 02:40 PM
#1
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Loss of power/mpgs after oil change
So I had my oil changed at 20,000 miles and since then, my truck seems like it's lost power and it's certainly lost mpgs...like 2-3.
Details on the truck are
2014 FX4 SCREW with 6 1/2' bed, 5.0L, 3.55.
Mods:
4" BDS Lift
305-55-20
Tuner with 5 Star 87 perf/tow tune and have adjusted for bigger wheel size.
PLEASE READ THIS!!!
The mpgs were fine before the last oil change EVEN WITH THESE MODS.
Of course, I did lose some mpgs after the lift and bigger tires but the loss of power and mpgs only happened after the oil change.
After the mods, I lost a few mpgs as expected but now, my city mpgs are 10/11 when it used to be (after the mods) 13/14.
I reloaded the tune and it made no difference.
What could have happened from an oil change to make it so different.
Oh, Ford does all my oil changes and I go every 5,000 miles.
Details on the truck are
2014 FX4 SCREW with 6 1/2' bed, 5.0L, 3.55.
Mods:
4" BDS Lift
305-55-20
Tuner with 5 Star 87 perf/tow tune and have adjusted for bigger wheel size.
PLEASE READ THIS!!!
The mpgs were fine before the last oil change EVEN WITH THESE MODS.
Of course, I did lose some mpgs after the lift and bigger tires but the loss of power and mpgs only happened after the oil change.
After the mods, I lost a few mpgs as expected but now, my city mpgs are 10/11 when it used to be (after the mods) 13/14.
I reloaded the tune and it made no difference.
What could have happened from an oil change to make it so different.
Oh, Ford does all my oil changes and I go every 5,000 miles.
05-11-2016, 03:27 PM
#3
Maybe there was some shearing in your old oil, the thinner oil felt better and gave better mpgs (as thinner oils do) and when they put fresh, non-sheared oil back in it felt like it should?
Either than or they put a heavier weight oil in on accident...only things I could really imagine. Make sure they didnt over/underfill it
Either than or they put a heavier weight oil in on accident...only things I could really imagine. Make sure they didnt over/underfill it
05-11-2016, 05:15 PM
#5
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Maybe there was some shearing in your old oil, the thinner oil felt better and gave better mpgs (as thinner oils do) and when they put fresh, non-sheared oil back in it felt like it should?
Either than or they put a heavier weight oil in on accident...only things I could really imagine. Make sure they didnt over/underfill it
Either than or they put a heavier weight oil in on accident...only things I could really imagine. Make sure they didnt over/underfill it
The warranty service was the solenoid that activates the 4WD. Wouldn't think that would effect the MPGs.
05-11-2016, 05:19 PM
#6
I'm going to guess they used the wrong weight oil, happens a lot. Have you ever changed the air filter? 20-30000 miles on average depending on terrain driven on. Dirt roads more frequent change will be required.
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05-11-2016, 06:23 PM
#8
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Loss of power/mpgs after oil change
Wrong oil could be it.
I've changed the air filter already...do off roading in dusty environments so I changed at 15k.
Regarding gas, drove around 200 miles on the same tank before I put new gas in.
The feeling was immediate when I picked it up.
If it is in fact heavier oil, what damage if any could it cause?
I'm about to take a 1200 mile trip...all highway.
I've changed the air filter already...do off roading in dusty environments so I changed at 15k.
Regarding gas, drove around 200 miles on the same tank before I put new gas in.
The feeling was immediate when I picked it up.
If it is in fact heavier oil, what damage if any could it cause?
I'm about to take a 1200 mile trip...all highway.
Last edited by justjimmy; 05-11-2016 at 06:25 PM.
05-11-2016, 06:45 PM
#9
If there's any question about the oil, change it before you go. Engine damage is possible.
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05-11-2016, 06:54 PM
#10
OP I can relate. Just put in Mobile 1 full syn. high mileage oil in my '09 5.4, same weight as usual (5w30), and am experiencing the very same symptoms. Possible high mileage oil flows a little thicker or something but regardless I never thought an oil could result in a performance difference up or down.