Oil Usage
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Freshman User
Joined: Apr 2004
Posts: 33
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From: La Porte IN
Oil Usage
My 2000 F-250 V-10 has 55,000mi and within the past 10-15,000mi it has used around a Quart 1/2 + between oil changes. It pulls every once in a while but not often, city driving and maybe 30mi daily running 65-70mph. What's wrong with it?
Fleet Mechanic
Joined: Nov 2001
Posts: 1,553
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From: Corpus Christi, TX
Is that a quart and a half, or half a quart? My V-10 (45k on the miles) uses 3/4 quart every 3,000. It's common for a V-10 to use some oil, do a search for it on this forum and you'll see that many have the same useage.
Post Fiend
Joined: Jun 2003
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From: NE Texas
Long story, short:
I decided to change from dino to synthetic about 30,000 miles ago. The initial "piston slap" noise went away immediately, but the engine began to drink the oil. (where it went I have no idea) After 4000 miles I went back to the recommended oil and since has lost no oil at all. I have gone over-mileage (about 4500 miles) sometimes and it's still on the full mark.
Did you happen to go synthetic?
I decided to change from dino to synthetic about 30,000 miles ago. The initial "piston slap" noise went away immediately, but the engine began to drink the oil. (where it went I have no idea) After 4000 miles I went back to the recommended oil and since has lost no oil at all. I have gone over-mileage (about 4500 miles) sometimes and it's still on the full mark.
Did you happen to go synthetic?
Post Fiend
Joined: Jun 2003
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From: NE Texas
Originally Posted by my69camaro1
Yep, mobil 1 syn.. 1 + 1/2 quarts sometimes more sometimes less. Just wanted to make sure it didn't need seals or something.
I still don't know if it would hurt anything, but can't see it helping.
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From: Massachusetts
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Elder User
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From: S.W. Oregon
Yes there are several long threads on this. The summary is that some V-10's use more oil than others. Some say no loss between changes, others have 1+ quarts. I change my oil every 3,000 miles. I check the oil between changes and sometimes have to add a quart at about 2,000 or 2,500 miles. Only place I think (some of) mine may be going is that occasional puff of blue smoke on start up. (There are several threads on that also)
bty. I use the Ford recommended oil.
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bty. I use the Ford recommended oil.
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Post Fiend
Joined: Jun 2003
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From: NE Texas
Originally Posted by MYFRST10
Hey big orn, After changing back to the dino oil
Did the slap come back, or has it been fine since?
Did the slap come back, or has it been fine since?
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Check out this link, and go to the NOACK VOLATILITY section. Look at the bar graph of the %'s lost through evaporation. According to this, it seems Mobil 1 will lose almost 9% of it's volume, but never says what the time interval is. This means in a 6qt V10, you'll lose 1/2 a qt just through evaporation - I'm assuming over the oil change interval, 3K maybe?
http://www.1st-in-synthetics.com/10W30test.htm
I've read just before, that 5w30 requires more high volatility molecules in the oil, so the consumption would be even higher than 10w30, which I'm assuming that bar graph shows.
Interesting reading. I wonder why I use NO oil between changes with dino Castrol 5W30 ? Nothing to evaporate? (and when I say NO, I mean "none whatsoever" - same point on the dipstick each time, after letting it sit for an hour).
I am NOT knocking synthetics, so don't flame me.
http://www.1st-in-synthetics.com/10W30test.htm
I've read just before, that 5w30 requires more high volatility molecules in the oil, so the consumption would be even higher than 10w30, which I'm assuming that bar graph shows.
Interesting reading. I wonder why I use NO oil between changes with dino Castrol 5W30 ? Nothing to evaporate? (and when I say NO, I mean "none whatsoever" - same point on the dipstick each time, after letting it sit for an hour).
I am NOT knocking synthetics, so don't flame me.
FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
The Noack D-5800 spec is measured this way (from a tester manufacturer):
Measures the evaporation loss of lubricating oils as a sample is heated to 250°C and an air stream is passed over its surface for 1 hour.
This isn't quite what happens in an engine... I don't think our oil gets even near 250C, but it might explain the oil consumption rates some people see... they aren't burning it, the oil is just evaporating off and being sucked into the intake through the PCV system.
I don't ride my V10 hard, I hardly pull anything or carry a load. So my oil temp is probably always quite low. You other guys might be running much higher than I do, therefor more oil is "used" (really boiled off).
art k.
Measures the evaporation loss of lubricating oils as a sample is heated to 250°C and an air stream is passed over its surface for 1 hour.
This isn't quite what happens in an engine... I don't think our oil gets even near 250C, but it might explain the oil consumption rates some people see... they aren't burning it, the oil is just evaporating off and being sucked into the intake through the PCV system.
I don't ride my V10 hard, I hardly pull anything or carry a load. So my oil temp is probably always quite low. You other guys might be running much higher than I do, therefor more oil is "used" (really boiled off).
art k.
Posting Guru
Joined: Mar 2002
Posts: 2,245
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From: Vancouver Wash USA
Originally Posted by krewat
The Noack D-5800 spec is measured this way (from a tester manufacturer):
Measures the evaporation loss of lubricating oils as a sample is heated to 250°C and an air stream is passed over its surface for 1 hour.
This isn't quite what happens in an engine... I don't think our oil gets even near 250C, but it might explain the oil consumption rates some people see... they aren't burning it, the oil is just evaporating off and being sucked into the intake through the PCV system.
I don't ride my V10 hard, I hardly pull anything or carry a load. So my oil temp is probably always quite low. You other guys might be running much higher than I do, therefor more oil is "used" (really boiled off).
art k.
Measures the evaporation loss of lubricating oils as a sample is heated to 250°C and an air stream is passed over its surface for 1 hour.
This isn't quite what happens in an engine... I don't think our oil gets even near 250C, but it might explain the oil consumption rates some people see... they aren't burning it, the oil is just evaporating off and being sucked into the intake through the PCV system.
I don't ride my V10 hard, I hardly pull anything or carry a load. So my oil temp is probably always quite low. You other guys might be running much higher than I do, therefor more oil is "used" (really boiled off).
art k.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Originally Posted by ken04
Wow, that was a very interesting couple of posts. Evaporation eh ? That wasn't something I'd ever heard of, seems plausible to me I guess. Don't all modern engines have basically a closed loop system in the crankcase to recover evaporated oil fumes ? Or is this a whole different animal you're talking about ? I love stuff like this so I'm looking forward to your reply, thanks, Ken
Short-chain polymers have a lower boiling point than the rest of the oil - the same polymers that keep the viscosity low. Like the 5W in 5W30. That's quote a stretch, so they have to put more short-chain polymers in the oil, thereby increasing the evaporation rate.
Which is what Amsoil was trying to say - their 10w30 is better than 5w30 because it doesn't have the extra crap that evaporates quicker. What that does for cold-start viscosity worries me...
Now where this leaves us with the dino vs. synth oil consumption, I don't know - but I do know that many people here that say they don't burn oil use dino. While most of those complaining about oil consumption are using synth.
One of the many initial reasons to use synth was oil consumption would be lower. Guess they were wrong... at least in Ford modulars.
I'd love to see a real study of oil temp vs. oil consumption by brand and dino vs. synth.
Posting Guru
Joined: Mar 2002
Posts: 2,245
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From: Vancouver Wash USA
Originally Posted by krewat
Which is what Amsoil was trying to say - their 10w30 is better than 5w30 because it doesn't have the extra crap that evaporates quicker. What that does for cold-start viscosity worries me...
I'd love to see a real study of oil temp vs. oil consumption by brand and dino vs. synth.
I'd love to see a real study of oil temp vs. oil consumption by brand and dino vs. synth.
I'd like to see such a report also, would be very interesting. If you find one I'd love to see it, thanks again bro, Ken