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#1
06-12-2009, 11:10 PM
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GMC 8.1 oil use
Anyone hear anything abot the 8.1 engine using oil? MIne had just started using about a quart per 1000 miles, more with towing. Started suddenly, thought I just didn't tighten the filter enough, but did it after another change too. ANy tips?
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#2
06-12-2009, 11:22 PM
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Both of the 8.1's that I race with use at least a QT every change.
Check/ post here. http://www.dieselplace.com/forum/forumdisplay.php?f=9 |
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#3
06-14-2009, 12:34 AM
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Quote:
__________________
1959 catalina 4dr a/c car 1970 gp strip car ... 1972 gp j 455/4 1971 bonneville hearse 455/4 1972 grand safari wagon 6 pass 455/4 1995 Firebird Formula 5.7 convertible 2002 gp 40th anniv. SC V6 2003 gmc sierra 2500hd 8.1 liter  ***LIKE MY FACEBOOK PAGE https://www.facebook.com/GratefulParts*** http://stores.shop.ebay.com/GRATEFUL...__W0QQ_armrsZ1 |
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#4
06-12-2009, 11:34 PM
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We have one in one of the work trucks. It uses oil too and has since it was new. Maybe more than yours does.
__________________
Go Fast... Return... Go Fast Again... Who cares about left turns??? |
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#5
06-13-2009, 12:16 PM
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Sounds like it's intrinsic to the engine and how hard you use it.
Just curious, going to send it in the body shop to fix all the dingers, so sounds llike no reason to dump the truck. KV |
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#6
06-13-2009, 06:36 PM
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No worries Keith...I have been laughed at when I talked to the dealer about the same issue. Apparently the fact that I was at least (sometimes more) a quarter low before oil change was normal and if I was only a quart meant I had one of the better ones.
I love that motor and it treats me very well...I also work her hard so I imagine its ok if she gets a little thirsty! Dave
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403 afficionado...made it my personal quest to maximize the power potential of the 403. www.fcrperformance.com |
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#7
06-13-2009, 08:36 PM
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I've read up on this a little bit, in prep for buying an 8100 Burb.
What most owners do is drop the t-stat rating down to 160.( or 180 I forget). This does two things, it keeps the engine out of tque management ( reduces timing) and several owners has reported that the oil consumption either stopped or was greatly reduced. Apparently the power is reduce significantly when the engine temp gets high enough where the ecm starts pulling timing out. Curious, does your 8100 have the cold piston slap? |
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#8
06-14-2009, 12:18 AM
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The one that I have at work doesn't have any cold piston slap, but it does use oil. It has since it was new. The mechanic that drives it now just keeps oil in the truck and adds when it's needed. The truck has LOTS of power to pull the emergency trailer, which is loaded top to bottom. The F350's we have can't begin to pull like the 8100.
__________________
Go Fast... Return... Go Fast Again... Who cares about left turns??? |
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#9
06-14-2009, 12:30 AM
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Quote:
__________________
1959 catalina 4dr a/c car 1970 gp strip car ... 1972 gp j 455/4 1971 bonneville hearse 455/4 1972 grand safari wagon 6 pass 455/4 1995 Firebird Formula 5.7 convertible 2002 gp 40th anniv. SC V6 2003 gmc sierra 2500hd 8.1 liter ***LIKE MY FACEBOOK PAGE https://www.facebook.com/GratefulParts*** http://stores.shop.ebay.com/GRATEFUL...__W0QQ_armrsZ1 |
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#10
06-14-2009, 06:52 AM
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Have no piston slap at all at 62K. My 01 Tahoe 5.3 had it at 40k and we drove that to 125k without issue. 07 tahoe 5.3 has 35k, no slap.
8.1 pulled the mountain out of Charlotte NC fully loaded towing open trailer with 4500 lbs 72 GP on it....at 75 mph, dusting cars. Did Snowshoe Mt in western PA annully to Norwalk, loaded with part, 24 ft enclosed trailer with cars and parts the same. Even can accellerate on these hills when the trucks hold you up. 2500HD 4.10 open, Allison auto. |
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#11
06-14-2009, 08:27 AM
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We have a 2003 2500 with the 8.1 only 20,000 miles but most of them pulling a 24 ft. enclosed car trailer. It used a quart per 1,000 miles up till 2 years ago, now it does not use any for some reason. We have used mobile one from day one also. Crazy.
__________________
1979 Pontiac Trans Am - W72 400 - 4speed - WS6 - Heritage Brown - Air Conditioning |
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#12
06-14-2009, 09:29 AM
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Keith run Rotella thru it for a service period and see if the consumption slows down.
Mike
__________________
so many pontiacs, so little time.................. moderator is a glorified word for an unappreciated prick.................. "Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." --Albert Einstein "There is no such thing as a good tax." "We contend that for a nation to tax itself into prosperity is like a man standing in a bucket and trying to lift himself up by the handle." - Winston Churchill |
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#13
06-15-2009, 10:52 PM
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Keith:
I'll build you a 400 Poncho like I had in the '81. No oil use, better mileage and similar power to boot.
__________________
Rich The real democratic American idea is, not that every man shall be on a level with every other man, but that every man shall have liberty to be what God made him, without hindrance. Henry Ward Beecher "The problem with socialism is that you eventually run out of other people's money." Margaret Thatcher |
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#14
06-16-2009, 12:22 AM
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If I didn't have a project or two........
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