Losing Oil
#1
Losing Oil
I have a 2007 Tahoe LTZ 5.3 and in between oil changes I lose between 1-2 quarts of oil. I'm not burning it and it's not leaking anywhere. I am using a high quality oil has anyone else had this problem? Does anyone know what the cause could be?
#2
CF Junior Member
It really comes down to three choices...
1. It is leaking externally and you have not noticed it. Maybe it only happens at speed, or it collects in a frame rail and doesn't get cleaned out until you are driving. IMO, this is an unlikely situation.
2. It is leaking into your coolant. Although, I believe that you would have noticed many other problems if you had 2 quarts of oil leak into your coolant. However, you should still visually check your coolant to see if it is contaminated.
3. Your engine is leaking internally, i.e. burning oil. It may be burning so little that you don't notice it or maybe it only burns on startup from overnight valve leakdown. This is the most likely scenario. From the other posts I have seen here, there seem to be other reports of the 5.3 losing oil and no one seems to have found the cause.
#5
Administrator
Maybe if it has a 100K+ miles on it or hasn't been maintained. If you're using 2 qts in 4K mi, you've got a problem. Unless you're talking about a hi-perf engine w/ loose tolerances.
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#8
Administrator
And they wonder why GM went bankrupt.
If a new engine still burns a qt/1200 after 1K mi., it's got a problem. May not get any worse but somewhere there's something wrong like rings that didn't seat properly or bad valve seals.
If a new engine still burns a qt/1200 after 1K mi., it's got a problem. May not get any worse but somewhere there's something wrong like rings that didn't seat properly or bad valve seals.
#9
this is a long time since thread started, but was looking at stuff and noticed that you had same problem. i have 2007 suburban 5.3 and was losing oil like crazy. no drips on pavements. put truck up and got under and what do you know. the oil filter was just a little loose. when it was traveling down road, it leaked. tightened it right up and problem solved. the filter is in a very tight spot and hard to tighten without the loop, or bandlike tightener tool. later on i noticed the problem again. i had gripped the oil filter too tight with the filter wrench, and put a pinhole leak in it. now im very very careful. ha ha. so i can see how this would be very easy to make this mistake and think its engine trouble. good luck.
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November 3rd, 2014 11:37 PM