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Sierra

corey006

Junior Member
Location
al,can
I bought a 2001 Sierra 5.3 Sle Ext Cab this Fall brand new.

I changed the oil at 2500 kms and noticed that there was only about 5 liters of oil. I put in 5.7 liters of Mobil 1 Tri-Synthetic 5w30. This brought the oil level to about the 4th hole on the dipstick. Now at 4000 kms the oil is at about the 3rd hole(I am guessing it is about 5 liters again).

I had noticed some oil that had dripped on the concrete outside the house on the driveway. I had it in the shop and they said they couldn't find any oil leak.

They said it was from when I changed the oil and some got onto the Skid plate. I guess I am wondering if the the oil level should go down at all because of engine break in or do I have a leak or did I buy a Truck with a LEMON engine.

HELP...........
 

Dave mcjr

Junior Member
Well if i were you i would give it some
more time for break in. if it persists that
i would be concerned, check the tail pipe for
any oil residue, if just black dust comes out
on your finger thats ok. but it you rub you
fingers together and it feels oily then you have
an oil burning problem, also when your driving
and you hit the gas hard pay attention to the
rear and see if you get any smoke, if you do
tell the dealer this so that they can try it
and verify and make a proper repair. if you
dont get any smoke and the oil level keeps
going down and the dealer cannot find a leak
ask them if you can take a look while it is up
on the hoist, then you can see for your self...
I work at a chrysler dealer part time and as they
say the customer will not believe unless they
see for them selves, as i also believe for my
GMC truck when at the gm dealer...if nothing else
call gm and see what they say.......dave.
 

Dave mcjr

Junior Member
by the way i should have let you know that i
drive a 2000 gmc 1500 4x4 with the 5.3 and the
oil level has stayed the same between oil changes
since i bought it new....
....dave.
 

staley52

Member
Location
Iowa
normal oil consumption some engines just use a little oil and it all depends on the use of the engine I have a 1994 4.3 that I work the hell out of and when I do it will burn a quart in 500 miles but when just daily drivin I go 5000 miles on mobile one and not burn a drop doing 120 miles a day
 

John DiMartino

PlowSite.com Veteran
Location
Walden,NY
Oil consumption is normal during break in,i wouldve waited longer before i went to synthetic oil,this may delay break in and it will use oil even longer.Id wait a while before you take it to the dealer.Dont forget the Vortec engines use low tension rings,which pass more oil than normal rings.The higher you rev it the more oil they will use.Gm is able to get about 6-10hp more out of an identical engine by using these rings,the downside is oil consumption when run hard,and sometimes when not run hard.
 

porter

Junior Member
Location
canada NB
Hey i have a 2002 chev ext cab z71 i had the same problem the lines were bad in it. and they had to relpace them a new truck should never burn that much oil in a million years. mine also dropped the transmission fluid. if you leased it then it's there problem but if you bought it then it's a whole different story just put your foot down and tell them to check every stupid thing on it until it stops.

cheers
 
OP
C

corey006

Junior Member
Location
al,can
Just an update on my truck....still using oil. It is at 18000 kms. Noticed the other day that when it sat for 2 days without being started it blew BLUE smoke for about 5 secs then OK.


Took to shop and they figure it is the PCV valve(doesn't make very much sense to me????) I suggested that it may be a Vavle or valve seal???

Any thoughts.

It uses about .5 liter for every 1000 kms.
 

karl klein

Senior Member
Location
omaha,ne
it could be a pcv valve. but if it smokes after sitting for a while it does seam like a valve seal is the problem.i would have waited longer before switching to synthetic also. synthetics are knowen for leaking becuase of the smaller particals.
 

Pelican

2000 Club Member
Corey, I don't know how kilometers compare to miles, but you should run at least 5000 miles or more before switching to synthetic oils. They're so slippery the rings won't seat in.

I had a Ford Escort that I switched at 10,000 miles and ran it to 204,000 without ever going inside the motor. It spent most of its life at 3200 rpm and it got the same gas milage the day I sold it as when it was new. I'll swear by synthetics, I used Mobil 1.
 
OP
C

corey006

Junior Member
Location
al,can
Update

They changed PCV valve in truck.

Apparently GM has had a few problems with 5.3 engines using oil like mine. Funny nobody here has had the same problem????

I guess it is going to be a wait and see if it still uses oil now......

PS

Very funny thing is that GM requires that the GM mechanic adds oil to truck when the level is down. To keep track of consumption.....???? I guess you buy a 40,000 truck and they do NOT trust you when you tell them it using oil????

Back to Ford for me SOON!!!!!!
 
Last edited:

johngus

Senior Member
Location
long island,NY
Most automakers nowadays say oil consumption is normal at a quart every 1000 miles.They blame it on fuel injection being more precise than a carb. so there's no fuel going into the oil keeping it to what appears full.my bet would be a valve seal leaking.If your oil consumption isn't that terrible maybe leave it for now.I've seen many pre vortec small blocks smoke on statrup and still go 200k miles.Just get the dealer to document it for the future.Sometimes I hate to let someone try to fix a small problem only to end up causing bigger ones:( .I heard from someone I know with a 2002 Yukon 5.3 who has a slight knocking in the motor and the dealer says no fix at this time and GM extended his warranty to 6/60.They don't wanna fix nothing for free no more.
 

karl klein

Senior Member
Location
omaha,ne
i think a quart every 1000 miles is a lot of oil. my truck consumes about 1/2qt. every 3000 with synthetic. it didn't burn any oil before switching at 35.000 miles.
 
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