Can too much oil affect your mileage?

Walker1 · 07-09-2008, 01:57 PM

Hi,

It has been suggested that if the oil level in your crankcase is over the full mark your miles per gallon can be affected. It is this truth or speculation?

In both of my Prius's the crankcase oil level is approximately 1/8 of an inch over the full mark. If anyone knows for sure on this issue please let me know. I personally have not heard of too much oil in the crankcase lowering miles per gallon.

All feedback is appreciated.

Sufferin' Prius Envy · 07-09-2008, 02:12 PM

Quote:

Originally Posted by Walker1

It has been suggested that if the oil level in your crankcase is over the full mark your miles per gallon can be affected. It is this truth or speculation?
I personally have not heard of too much oil in the crankcase lowering miles per gallon.

You have not "personally" heard? But it "has been suggested"???? What the heck does that mean? Did you have to read about it and it wasn't personally whispered into your ear?

This topic has been beat to death and is all over PriusChat. A quick search will get you more information than will ever be posted in this - yet another

- oil overfill thread.

oil level overfill site

riuschat.com - Google Search

If you were a newbie, I may have considered being a little more diplomatic . . . but geeeessssssshhhhhhh! Member since Jan '06 with 852 posts.

Walker1 · 07-09-2008, 03:06 PM

Quote:

Originally Posted by Sufferin' Prius Envy

You have not "personally" heard? But it "has been suggested"???? What the heck does that mean? Did you have to read about it and it wasn't personally whispered into your ear?

This topic has been beat to death and is all over PriusChat. A quick search will get you more information than will ever be posted in this - yet another

- oil overfill thread.

oil level overfill site

riuschat.com - Google Search

If you were a newbie, I may have considered being a little more diplomatic . . . but geeeessssssshhhhhhh! Member since Jan '06 with 852 posts.

I have not used any search or advanced features since joining. I usually read posts and follow links. I will heed your advice.

If you tell me something I'm not aware of that makes you look good and helps me learn new info. Sound good?

bwilson4web · 07-09-2008, 03:45 PM

It seems to have an effect:

Bob Wilson

Ichiro · 07-09-2008, 08:55 PM

My prius crankcase is over-filled too. Darned Toyota dealer.

Any suggestions for easily & cleanly draining a half quart or so without resorting to removing the drain plug !? I was thinking about a really long straw

Bill Merchant · 07-09-2008, 10:55 PM

I used 1/4" aquarium air-tubing (slides down the dip-stick tube) and a large irrigation syringe. A bit difficult to pull the plunger out, but it worked for a minor over-fill.

ualdriver · 07-09-2008, 11:12 PM

Quote:

Originally Posted by Ichiro

My prius crankcase is over-filled too. Darned Toyota dealer.

Any suggestions for easily & cleanly draining a half quart or so without resorting to removing the drain plug !? I was thinking about a really long straw

SkyMall - Oil Extractor=

a search on Google shopping with "oil extractor" has some items as well.

AMG · 07-10-2008, 06:02 PM

Nice find, anybody have experience with this product ? does it work well with the Prius ?

PearlDriver · 07-10-2008, 06:31 PM

I just used a squirt bottle with a long tube. I took out 1 cup (was at full) increased mileage 2 mpg on the next day's 140 mile commute.

Walker1 · 07-10-2008, 07:47 PM

How much under the full mark should the oil level be? Is there anything that most of you agree on regarding this issue? Also, how does someone gain 3-4 MPG by lowering the oil level?

07-09-2008, 01:57 PM	#1
Walker1 Senior Member Join Date: Jan 2006 Location: FL Posts: 862 My Car: 2008 Prius Package: #2 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Can too much oil affect your mileage? Hi, It has been suggested that if the oil level in your crankcase is over the full mark your miles per gallon can be affected. It is this truth or speculation? In both of my Prius's the crankcase oil level is approximately 1/8 of an inch over the full mark. If anyone knows for sure on this issue please let me know. I personally have not heard of too much oil in the crankcase lowering miles per gallon. All feedback is appreciated.

07-09-2008, 03:45 PM	#4
bwilson4web Senior Member Join Date: Nov 2005 Location: North Alabama Posts: 1,307 My Car: 2003 Prius Package: #1 Nominated 2 Times in 2 Posts TOTM Awards: 0 Friends: 5	Re: Can too much oil affect your mileage? It seems to have an effect: Bob Wilson

07-09-2008, 08:55 PM	#5
Ichiro Senior Member Join Date: Apr 2008 Location: SF Posts: 192 My Car: 2008 Prius Package: #2 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Re: Can too much oil affect your mileage? My prius crankcase is over-filled too. Darned Toyota dealer. Any suggestions for easily & cleanly draining a half quart or so without resorting to removing the drain plug !? I was thinking about a really long straw

07-09-2008, 10:55 PM	#6
Bill Merchant absit invidia Join Date: May 2005 Location: USA \| Oregon \| Portland area \| 97004 \| Posts: 3,926 My Car: 2007 Prius Package: #5 Nominated 6 Times in 1 Post TOTM Awards: 0 Friends: 47	Re: Can too much oil affect your mileage? I used 1/4" aquarium air-tubing (slides down the dip-stick tube) and a large irrigation syringe. A bit difficult to pull the plunger out, but it worked for a minor over-fill.

07-10-2008, 06:02 PM	#8
AMG Junior Member Join Date: Apr 2008 Location: LA, CA Posts: 29 My Car: 2008 Prius Package: #6 Touring Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Re: Can too much oil affect your mileage? Nice find, anybody have experience with this product ? does it work well with the Prius ?

07-10-2008, 06:31 PM	#9
PearlDriver Member Join Date: Aug 2007 Location: Snohomish, WA Posts: 54 My Car: 2007 Prius Package: #3 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Re: Can too much oil affect your mileage? I just used a squirt bottle with a long tube. I took out 1 cup (was at full) increased mileage 2 mpg on the next day's 140 mile commute.

07-10-2008, 07:47 PM	#10
Walker1 Senior Member Join Date: Jan 2006 Location: FL Posts: 862 My Car: 2008 Prius Package: #2 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Re: Can too much oil affect your mileage? How much under the full mark should the oil level be? Is there anything that most of you agree on regarding this issue? Also, how does someone gain 3-4 MPG by lowering the oil level?

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