Low oil level. Catch can filling fast - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 12 (permalink) Old 01-26-2019, 05:19 PM Thread Starter
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Low oil level. Catch can filling fast

During tire rotation mechanic found some oil around the oil pan and level was low. My garage floor seems pretty clean so don't think it's leaking a lot there. I did notice my catch can is filling up quick.

What could it be?
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post #2 of 12 (permalink) Old 01-27-2019, 12:59 PM
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Make sure your PCV valve is working correctly. If it, is look for a source of excessive blow-by. This could be caused by a number of things like a scratched cylinder liner or broken or cracked ring(s). If the PCV valve checks out OK the next thing would be to run a compression and leakdown check on each cylinder.

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post #3 of 12 (permalink) Old 01-27-2019, 01:32 PM Thread Starter
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Originally Posted by SRM6 View Post
Make sure your PCV valve is working correctly. If it, is look for a source of excessive blow-by. This could be caused by a number of things like a scratched cylinder liner or broken or cracked ring(s). If the PCV valve checks out OK the next thing would be to run a compression and leakdown check on each cylinder.
I thought the G8's didnt have PCV valves.
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post #4 of 12 (permalink) Old 01-27-2019, 02:12 PM
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There is one listed for the V6 too.
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File Type: jpg G8 PCV Valve.JPG (39.5 KB, 12 views)

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post #5 of 12 (permalink) Old 01-27-2019, 04:23 PM Thread Starter
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There is one listed for the V6 too.
Where is it located on the GT and how do I change it?
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post #6 of 12 (permalink) Old 01-27-2019, 05:06 PM
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L76 does not have a pvc valve. It uses a flow restricting oriface. Are you using aftermarket valve covers? If so, add a flow restrictor on the pcv line before the catchcan.

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post #7 of 12 (permalink) Old 01-27-2019, 05:26 PM Thread Starter
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Originally Posted by JCMG8 View Post
L76 does not have a pvc valve. It uses a flow restricting oriface. Are you using aftermarket valve covers? If so, add a flow restrictor on the pcv line before the catchcan.
Using stock valve covers.
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post #8 of 12 (permalink) Old 01-28-2019, 07:42 AM
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How do you have the can hooked up? A compression test as mentioned would be a good idea to check for blow by also.

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post #9 of 12 (permalink) Old 01-28-2019, 07:46 PM
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Check the driver side rocker cover. Make sure its part number 12570427.

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post #10 of 12 (permalink) Old 01-28-2019, 10:07 PM
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Check the driver side rocker cover. Make sure its part number 12570427.
If the port on the d/s valve cover is capped and the oil cc is routed between valley port and tb(fresh air line from post maf on intake to PD valve cover)? Would it make a difference if it's the old or updated valve cover?


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post #11 of 12 (permalink) Old 01-29-2019, 09:42 AM
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Originally Posted by G8eraid View Post
If the port on the d/s valve cover is capped and the oil cc is routed between valley port and tb(fresh air line from post maf on intake to PD valve cover)? Would it make a difference if it's the old or updated valve cover?


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It wouldn't.

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post #12 of 12 (permalink) Old 02-19-2019, 08:39 AM
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Great information shared. . .
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