highway oil consumption - Chevy SS Forum
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post #1 of 20 (permalink) Old 08-15-2019, 03:55 AM Thread Starter
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highway oil consumption

my 2014 SS (with around 40K miles now) has been using about 1 quart of oil at 2500
to 3,000 miles highway. But only when I am driving steady highway miles like at 65 to around 85 miles an hour. When I am mostly driving around town it has been using just a touch and barely readable on the stick. But then back to freeway speeds and then the oil goes back down on my stick.

I am using Mobil One 5W-30 synthetic and an AC oil filter

Do you think this is normal? or do I have a problem that is developing?

None of my other engines do this and I own 8 cars now.

thanks
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post #2 of 20 (permalink) Old 08-15-2019, 04:59 AM
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You should send your oil to Blackstone labs... They will tell you about the state of your engine.


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post #3 of 20 (permalink) Old 08-15-2019, 07:27 AM
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Ls3s can be tricky reading oil level, has the car sat for 24 hr when you are reading low?

There are numerous threads on oil level that have lots of info.

Mine is a 16, with a supercharger, after long hwy run it will read 1/2 qt to 3/4 qt low but by next morning.... back to full (could be the oil ferries helping me out)Ö..

On the other hand your PVC could be drawing too much back into the intake.

Or you have a brittle oil ring or two that is passing oil into a cylinder.

the oil testing is a good idea however you will need multiple tests to get a reliable trend and info.

Good luck,
tp
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post #4 of 20 (permalink) Old 08-15-2019, 09:46 AM
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additionally higher revs tends to let oil slip by.

while there is contradicting thoughts on break in , how the car was broken in may also contribute to oil loss.

2500-3000 a quart for me i wouldnt complain. as a reference the gt350s are burning a quart every 1,000.

run the above tests and throw in a catch can.


good luck

ppp
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post #5 of 20 (permalink) Old 08-15-2019, 11:52 AM
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3000 miles per quart would not cause concern if you mentioned it to your service department.

Highway driving in the SS is what...2000 - 2500RPM? Not a situation that should exacerbate oil consumption. I run almost exclusively highway. Now at 47,000 miles and have never added oil. Engines are individuals, some use a little oil and some donít.
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post #6 of 20 (permalink) Old 08-15-2019, 12:24 PM
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Quote:
Originally Posted by slsgxpgtpman View Post


Do you think this is normal? or do I have a problem that is developing?

None of my other engines do this and I own 8 cars now.

thanks
GM says that it is acceptable, 1 quart in 2,000 miles.
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post #7 of 20 (permalink) Old 08-15-2019, 12:30 PM
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Good topic and info to know guys. Thanks.

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post #8 of 20 (permalink) Old 08-15-2019, 09:18 PM Thread Starter
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Quote:
Originally Posted by htp69 View Post
Ls3s can be tricky reading oil level, has the car sat for 24 hr when you are reading low?

There are numerous threads on oil level that have lots of info.

Mine is a 16, with a supercharger, after long hwy run it will read 1/2 qt to 3/4 qt low but by next morning.... back to full (could be the oil ferries helping me out)Ö..

On the other hand your PVC could be drawing too much back into the intake.

Or you have a brittle oil ring or two that is passing oil into a cylinder.

the oil testing is a good idea however you will need multiple tests to get a reliable trend and info.

Good luck,
tp
No I did not wait 24 hours to check after shutdown, but checked after eating at a Cafe while car was parked at motel which was just over an hour and then again in the next morning some 13 hours later and the oil reading stayed the same . So i added some that I carry in trunk. My SS did the same again after the next 2600 mile cruise, did however get the car when passing just over triple didgets a few times and the heat of many of the days was over 100 degrees.
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post #9 of 20 (permalink) Old 08-15-2019, 10:31 PM
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Quote:
Originally Posted by slsgxpgtpman View Post
No I did not wait 24 hours to check after shutdown, but checked after eating at a Cafe while car was parked at motel which was just over an hour and then again in the next morning some 13 hours later and the oil reading stayed the same . So i added some that I carry in trunk. My SS did the same again after the next 2600 mile cruise, did however get the car when passing just over triple didgets a few times and the heat of many of the days was over 100 degrees.
Welp there 'ya go. Answered your own question. This is why all details are important.

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post #10 of 20 (permalink) Old 08-16-2019, 02:58 AM
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manual or auto? reason I ask is the LS can consume oil in certain driving conditions, maybe your doing more engine braking/downshifting then you realize on the express way? (still feasible with the auto with paddle shift) its perfectly normal if thats the case.

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Last edited by holler; 08-16-2019 at 03:09 AM.
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