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Old 06-17-2013, 02:47 PM   #1
cW6mT mKviGTi
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Question oil change killed gas mileage

Hello and good day to all. When i had my MK6 GTi i switched from the OEM castrol 5w-40 to mobil 0w-40 @ around 2k miles and noticed my average mpg increase from around 26 ish mpgs to around 28-29 mpgs (mixed city and highway) which increased my full up to full up range about 30 miles.

With my new GLi i switched out the OEM castrol (assuming this is what they still use) 5w-40 to mobil 0w-40 at 1600 miles and my average mpg's went from 30-31 mpgs (before oil change) to about 27-28 mpgs(after oil change) with the same mixed city and highway driving. My range decreased from the average 360's to around 320 ish miles per tank full.

My driving style hasn't changed, i take the same route to and from work, traffic patterns are pretty much the same, no extra warm up times or idling, no new mods, not running the a/c more than before but the outside temp did change from an average of 60's and 70's to 70's and 80's.

The only thing that had me skeptical was the mobil 1 that was used in the gti was the 5 liter jug that i would purchase from advance. The mobil 1 in the gli is from walmart and is about 15 dollars cheaper but instead you get 5 quarts instead of 5 liters (doubt its a made in usa thing vs made in germany since they're both 0w-40's).

When the GLi was new i could get 34-35 mpg's crusing at 65 with no sweat. Now i'm lucky if i get 30 mpg's on the MFD. To my knowledge as the motor breaks in and gets more loose the mpg's would increase as it did in the gti but not in this case. I have OCD with my car's overall performance and this is bugging me. Has anyone else experience anything similar? Thank you for your time.

Last edited by cW6mT mKviGTi; 06-17-2013 at 03:13 PM.
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Old 06-17-2013, 02:51 PM   #2
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It's the same engine so I'm not sure. Why would you use 0w anyway?
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Old 06-17-2013, 02:59 PM   #3
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1. OP: next time please break up your post with paragraphs and spacing, so it's easier to read.

2. Merkle: M1 0W-40 is an excellent oil and 502 approved. Why wouldn't he use it?

As to the answer, I'm afraid I can't add anything. A lot of people really like M1 0W-40. There are a number of factors in gas mileage and the MFD isn't the most accurate way to check it.
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Old 06-17-2013, 03:18 PM   #4
cW6mT mKviGTi
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I use the MFD at a glance while driving but for the most part i usually reset the trip and full up. Then when i refill i take the amount filled and divide it into the amount of miles indicated on trip counter before resetting again for the next cycle.
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Old 06-17-2013, 03:19 PM   #5
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Quote:
Originally Posted by Merkle View Post
It's the same engine so I'm not sure. Why would you use 0w anyway?
German Castrol is 0w-30 and is excellent oil as well, especially in cold weather.
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Old 06-17-2013, 03:20 PM   #6
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I somehow doubt this is related to engine oil period.
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Old 06-17-2013, 03:27 PM   #7
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Quote:
Originally Posted by mattdibart View Post
German Castrol is 0w-30 and is excellent oil as well, especially in cold weather.
OP wasn't using GC. He was using 5W-40.

I agree, though, that GC is a better oil.
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Old 06-17-2013, 03:43 PM   #8
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quit being so anal about it, and just drive the car. switch to something else on the mfd and don't stare at it the whole time you drive. It's not related to the oil, it's most likely that something changed the fuel trims. You could reset those and start over though.

They aren't using GC at the dealer, it's run of the mill 5w40 syntec crap. I don't buy into the whole 502 testing, I think it's a farce. Shell Rotella 5w40 has served me well
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Old 06-17-2013, 03:44 PM   #9
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Quote:
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OP wasn't using GC. He was using 5W-40.

I agree, though, that GC is a better oil.
my post was in reply to Merkle not the OP
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Old 06-17-2013, 03:53 PM   #10
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Quote:
Originally Posted by cW6mT mKviGTi View Post
Hello and good day to all. When i had my MK6 GTi i switched from the OEM castrol 5w-40 to mobil 0w-40 @ around 2k miles and noticed my average mpg increase from around 26 ish mpgs to around 28-29 mpgs (mixed city and highway) which increased my full up to full up range about 30 miles.

With my new GLi i switched out the OEM castrol (assuming this is what they still use) 5w-40 to mobil 0w-40 at 1600 miles and my average mpg's went from 30-31 mpgs (before oil change) to about 27-28 mpgs(after oil change) with the same mixed city and highway driving. My range decreased from the average 360's to around 320 ish miles per tank full.
These are substantial changes in mileage you attribute to engine oil. I've been driving a long time, lots of different vehicles through many oil changes. While I think a quality oil will extend your engine life, I've never experienced any change in mileage due to the oil used. But if you think it's the oil, go with the one your vehicle seems to do best with and move on.
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Old 06-17-2013, 04:46 PM   #11
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I somehow doubt this is related to engine oil period.
Yup...
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Old 06-17-2013, 04:57 PM   #12
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I thought this thread was going to be a castrol vs mobil 1 debate.
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Old 06-17-2013, 05:02 PM   #13
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Quote:
Originally Posted by fredf View Post
M1 0W-40 is an excellent oil and 502 approved. Why wouldn't he use it?
Oh. Good to know.
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Old 06-17-2013, 05:38 PM   #14
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The only reason why gas mileage would be affected is if he
1. Used a heavy weight oil like 20w-50 or something like that
or
2. over filled the oil to the point where the crank was completely submerged, aka putting a quart or more over the recommended fill amount
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Old 06-17-2013, 05:54 PM   #15
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could just be your tires' air pressures are lower now? Too many variables.

Maybe the walmart 0w-40 is indeed a little thicker than the Advance 5 liter jug?

Didn't Mobil 1 reformulate their 0w-40 a year ago? Is it still 502 approved?
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Old 06-17-2013, 10:49 PM   #16
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I've had less than great experience with Walmart synthetics (or "synthetics", perhaps) in my last couple vehicles. It looked and smelled different going in and coming out, and in my old 350 Chevy beater, I'd be 1/2 quart low at 2k rather than just over the low line. I never saw the same results from purchases at a local auto parts store with decent turnover. Similar luck with oil for my mower/snowblower and wife's 50cc scoot- always a little smoke with "el cheapo", but the same brand at Napa or Lowe's and no problems.

There are a thousand possible factors to consider, though- my experience is likely simple coincidence and imagination. YMMV :shrug:
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Old 06-17-2013, 10:57 PM   #17
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WTF ppl... seriously ?

I have used "walmart" mobil 1 for nearly 300k miles in one of my cars. And over 100k in my others, there is nothing "different" about it.
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Old 06-17-2013, 11:43 PM   #18
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I know its a stupid thing to stress over but I noticed it and was wondering if anyone else experienced something similar using such similar oil grades. In the gti i tried rotella t6, gc, redline 0w-40, and the oem oil but never noticed such a decrease in mpg almost instantly. I appreciate everyone's insight and taking the time to respond to my post. I wish you all a good week and happy motoring.
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Old 06-17-2013, 11:58 PM   #19
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Stop worrying so much lol. Mobil 1 0-40 is actually a pretty decent oil, and thats hard for me to say because I HATE 5-30 M-1. I run it in my GTI and GLI year round, can't beat it for the WM 5 quart jug price IMO.
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