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Old 10-26-2021, 01:53 PM   #1
VolvoScout
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Default ATF Effect on Fuel Economy

What effect do different brands of ATF have on the fuel economy (mpg) on the AW70 Volvo 240?

I flushed the old fluid on a 1990 240 and the fuel economy seems to have dipped about 3-5mpg. (The dip was pretty immediate after the flush...trying to figure out if it's the new ATF or something else)

Last month, I replaced the catalytic converter and o2 sensor and the economy boosted to 23-28mpg. Now it's back down to normal mpg. So, is the dip in my fuel economy related to the atf flush, or is it related to the o2 sensor and cat becoming "dirty" again or is there something else going on with the car that I should investigate?

Here is the ATF I used (Signature Amsoil): https://www.amsoil.com/p/signature-s...?code=ATFQT-EA

If the ATF is the cause of the reduced fuel economy, would any of these brands fair better?

OE Amsoil: https://www.amsoil.com/p/oe-multi-ve...ion-fluid-otf/

Pentosin: https://www.fcpeuro.com/products/aut...d-1-liter-atf1

Volvo OEM: https://www.fcpeuro.com/products/vol...enuine-1161321

Volvo OEM 2 (Why is this so much more money than the other volvo oem?): https://www.fcpeuro.com/products/vol...-liter-1161621

Redline: https://www.fcpeuro.com/products/red...smission-fluid
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Old 10-26-2021, 02:08 PM   #2
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Maybe you have a practical joker neighbor sneaking over at night and adding or subtracting fuel from your tank after you've worked on it.
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Old 10-26-2021, 02:12 PM   #3
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Old 10-26-2021, 02:48 PM   #4
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O2 failure in time with fluid change?
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Old 10-26-2021, 02:52 PM   #5
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I replaced the O2 last month.

Actually, I also replaced the rear brake pads & parkings brakes a few days prior to the flush....I wonder if they're sticking just enough to drag down the mpg but not enough to small or see smoke?
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Old 10-26-2021, 02:55 PM   #6
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Super Tech from the Walmart is my recco, but sounds like you have another issue.
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Old 10-26-2021, 03:22 PM   #7
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So basically it's a slim to no chance that the new ATF affected the fuel economy and I most likely have something else going on? Or did the new O2 and cat have a break-in time and now the MPG is back to what it should be?
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Old 10-26-2021, 03:53 PM   #8
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you know, I read your posts about the miraculous increase in MPG after an O2 and cat and thought it was nearly impossible to pick up 5-8 miles a gallon like that.
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Old 10-26-2021, 03:58 PM   #9
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Originally Posted by philski o'flood View Post
you know, I read your posts about the miraculous increase in MPG after an O2 and cat and thought it was nearly impossible to pick up 5-8 miles a gallon like that.
28mpg with Aw70 suggests it was probably running lean or something to me.
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Old 10-26-2021, 04:10 PM   #10
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Quote:
Originally Posted by dbarton View Post
Maybe you have a practical joker neighbor sneaking over at night and adding or subtracting fuel from your tank after you've worked on it.
Dave

Holy crap, forgot about that one. It is a classic!

Uninteresting unrelated story...
A guy I worked with bought a new motorcycle and of course brought it to work.
I snuck out and poured a small pool of oil or coolant (I forget) under it in a spot where there was no way it could of dripped from anything - but it was fresh fluid and looked daunting.
Poor guy went out to show others his new bike and then had WTF moments. Took an extended lunch to go to the dealer so they could check out the "problem". They found none, obviously. He was PISSED!
Not sure I ever told him.
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Old 10-26-2021, 04:43 PM   #11
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Quote:
Originally Posted by philski o'flood View Post
you know, I read your posts about the miraculous increase in MPG after an O2 and cat and thought it was nearly impossible to pick up 5-8 miles a gallon like that.
More likely he miscalculated once than gained and lost 5 mpg in the course of a month
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Old 10-27-2021, 06:22 PM   #12
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Maybe your gas went from summer to winter formula? That winter stuff doesn't seem to give optimal mileage in a car.
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Old 10-28-2021, 09:17 AM   #13
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Originally Posted by dl242gt View Post
Maybe your gas went from summer to winter formula? That winter stuff doesn't seem to give optimal mileage in a car.
I experience about a 1.5mpg drop going from Summer to Winter. Usually happens late September/early October around here.
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Old 10-28-2021, 10:46 AM   #14
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Originally Posted by dl242gt View Post
Maybe your gas went from summer to winter formula? That winter stuff doesn't seem to give optimal mileage in a car.
This. Plus the fact that temps are slowly dropping as we get deeper into autum, then winter so cold start enrichment will be used for a longer time. The engine oil will be colder (more viscous) from startup and will cause more pumping losses. Also, when temps go down the tire pressures will also go down a few psi. Obviously that can be corrected.
And the colder it is, the more battery charge it takes to start the engine, you use more power like blower, rear window defroster, lights, etc. The alternator needs to compensate for that by charging the battery back up. This causes additional drag on the engine.
All hurts MPG.

here are some nice extreme cold starts.

Last edited by Janspeed; 10-28-2021 at 11:05 AM..
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Old 10-28-2021, 12:18 PM   #15
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Originally Posted by dbarton View Post
Maybe you have a practical joker neighbor sneaking over at night and adding or subtracting fuel from your tank after you've worked on it.
Dave
It's probably the local chipmunks. They've been holding their AA meetings (Acorns Anonymous) under the car, lately.
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Old 11-03-2021, 05:44 PM   #16
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Originally Posted by kyote View Post
28mpg with Aw70 suggests it was probably running lean or something to me.
Secret: Keep them doggies rollin, and no more than double nickel speed.

With AW71L, 28mpg can be done within city streets when making use of AW71L's Georgia Overdrive, and avoiding stops....just got to Keep them doggies rollin

https://www.youtube.com/watch?v=AKC8pSFg1Vw
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Old 11-03-2021, 10:21 PM   #17
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Originally Posted by 84B23F View Post
Secret: Keep them doggies rollin, and no more than double nickel speed.

With AW71L, 28mpg can be done within city streets when making use of AW71L's Georgia Overdrive, and avoiding stops....just got to Keep them doggies rollin

https://www.youtube.com/watch?v=AKC8pSFg1Vw
Unfortunately around these parts double nickel will likely get you killed on the highway, even in the slow lane.

Last edited by kyote; 11-04-2021 at 11:27 AM..
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Old 11-04-2021, 07:55 AM   #18
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Originally Posted by kyote View Post
double nickel
Before double nickel, there were vehicle speed variations on interstates, but in recent years, it seems whatever is the posted maximum speed, traffic is doing that, or a pinch more.

I was traveling 70mph in a posted 75mph max interstate, and I did not pass up one vehicle for some 60 miles.

In western states, a person can still make good travel time on two lane highways. I avoid interstates when possible, where few vehicles travel these days in my regional driving area.
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