Author Topic: 8V-71N "Normal" Oil Consumption?  (Read 4496 times)

Offline Debo

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8V-71N "Normal" Oil Consumption?
« on: October 31, 2014, 12:24:36 PM »
Hi guys,

I'm getting ready to take the bus on its first long trip (1500 miles round-trip.) We're leaving the Outer Banks of NC and heading to Cedar Key, Florida in December. I've done many short trips of 100 miles or so, but I'm curious what would be considered a reasonably normal rate to expect my 8V-71N to burn oil on a long trip like this? Since my little hops have been kind of short, I don't really have a good feel for it yet. It fires up great, has good compression, and the rings still have healthy inspection grooves. No smoke to speak of, and she makes good power. Things appear pretty healthy to me, so I'm wondering how much oil might I expect to burn on the trip? Things I've read lead me to believe that a quart every 500 miles might be reasonable to expect. Does that sound about right to folks? For the record, I'm using Shell Rotella T straight 40 weight CF-2 rated oil.

Thanks in advance.
1981 MCI MC9
Detroit 8V-71N
Spicer 4-Speed Manual
Outer Banks, NC (Nags Head)

Offline Frank @ TX

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #1 on: October 31, 2014, 12:44:52 PM »
Hi Debo,
I have a 6V92 and have to add about 2 to 3 quarts between oil changes ( 10,000 - 12,000 miles ).
The engine has no leaks that run to the ground but it does have two wet spots.
If you have any leaks take care of them , the engine will look better and run cooler.
Frank

Online luvrbus

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #2 on: October 31, 2014, 01:46:35 PM »
Oil consumption on a DD is based on the rpm I can give you the average burn rate from the book for a 10 hr day but to be clear this is for a engine running 10 hrs at a continuous 1800 rpm under load so it will vary +or - the book says 1.25 qts  go to 2100 rpm 2 qts per 10 hrs and that is all DD gives you just a average
Life is short drink the good wine first

Offline Cary and Don

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #3 on: October 31, 2014, 03:21:03 PM »
The real question should be, How much oil should I take?  We carry four gallons.  If something really horrible happens and a line goes, or some other major problem,  we will have enough oil without having to find the hard to find Delo 100.  We just finished a 1400 mile trip with the Eagle, heavy, and a 8V71.  It used less than three quarts with some really hard climbing over most of the trip. On the flat, it hardly uses any on a trip of that length.

Don and Cary
1973 05 Eagle
Neoplan AN340

Offline Nineforever

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #4 on: October 31, 2014, 03:40:38 PM »
If space isnt a problem run with a couple cases on hand
Hyway 3 100 klms south of Yellowknife NWT Canada

Offline thomasinnv

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Re:
« Reply #5 on: October 31, 2014, 03:56:02 PM »
For my tired old girl, "normal" oil consumption is a gallon about every 400 miles.

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Offline gus

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #6 on: October 31, 2014, 03:57:44 PM »
I think I've added maybe 1-2 gal to mine since I got it in Dec. '10 and have gone 30,000 mi, but there are wide variances in these engines so that is only a guide. It was supposedly o/h not long before I got it.

My 4104 671 used a quart or two/500 mi but it had a lot more wear.
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Offline bevans6

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #7 on: October 31, 2014, 03:59:12 PM »
 one gallon per thousand miles is trending towards high, one gallon per three thousand miles I would be happy with.  Some people get twice that.  It depends on many different parameters, but the 8V-71 is not a conservative engine from an oil consumption point of view.  My engine is at the 2 to 3 thousand miles per gallon stage but it is quite new, only have about 4,000 miles on it at this point.

Take a case of three gallons with you, check the oil level at the same bus level and temperature.  The difference between hot and cold is about a half gallon in terms of simple expansion with temperature.   Also, these engines often use far less oil slightly underfilled.  I try to keep mine just over the fill mark on the dip stick.

Brian
1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Allison MT-647
Tatamagouche, Nova Scotia

Online luvrbus

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #8 on: October 31, 2014, 04:50:44 PM »
LOL depends on the oil brand also the DD likes clean oil
Life is short drink the good wine first

Offline TomC

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #9 on: October 31, 2014, 08:20:30 PM »
I carry three cases of Delo 100 40weight (12gal). Then you have enough for a complete oil change and then some. Good Luck, TomC
Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.

Offline Tony LEE

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #10 on: October 31, 2014, 08:56:25 PM »
I carry a 4 gallon can - mostly for "just in case"

Fill it up to the top mark and it will use far more oil than if filled to half way between max and min.

Offline niles500

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #11 on: October 31, 2014, 09:14:42 PM »
As Tony said, put it at the full mark then monitor it to see if it settles at a certain point on the dipstick and maintain it there and see if the consumption goes down. There is the sweet spot. FWIW
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Offline Emcemv

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #12 on: November 01, 2014, 11:21:17 AM »
We used about a gallon on a 3000 mile trip last year. I keep it just below the full mark on the dipstick, as said already, there is a sweet spot..
Bruce & Nancy Fagley
1973 MCI MC-7 Combo Freighter
450HP DD 8V-92T 2000 Reman
HT 740 Allison
Woodbury CT.

Offline gus

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #13 on: November 01, 2014, 07:18:21 PM »
one gallon per thousand miles is trending towards high, one gallon per three thousand miles I would be happy with.  Some people get twice that.  It depends on many different parameters, but the 8V-71 is not a conservative engine from an oil consumption point of view.  My engine is at the 2 to 3 thousand miles per gallon stage but it is quite new, only have about 4,000 miles on it at this point.

Take a case of three gallons with you, check the oil level at the same bus level and temperature.  The difference between hot and cold is about a half gallon in terms of simple expansion with temperature.   Also, these engines often use far less oil slightly underfilled.  I try to keep mine just over the fill mark on the dip stick.

Brian

A very good point, I learned long ago to never fill any engine to the full mark.

I had an airplane that would throw out the first quart in ten minutes then go on for hours on the next quart. Same with both my DDs and just about every other vehicle I own.
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Ash Flat, AR

Offline Homegrowndiesel

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Re: 8V-71N "Normal" Oil Consumption?
« Reply #14 on: November 01, 2014, 07:38:36 PM »
"normal" oil consumption? On my old leaky 8v71, if I fill it to the full mark, it will "leak" out 1/2 gallon in no time, If I run it at the low mark, it will go 1000 miles and not leak 2 quarts. YMMMV. Oh yea, Your Milage May Vary. In 1o years, if I keep it at the low level, I have to put in half as much. I do not know if that is "normal" but ,,,   ,,,   ,,, with an old 2 stroke I think it is "normal". I agree, take more with you than you burn or leak, I do not want to have to mix along the way.
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