Overfilled 5.3L Tahoe oil - started knocking on cold starts

[pacem]

2008 Tahoe, 250K, everything is original.
Don't know how I did it but for the first time in my life I overfilled the engine with oil, Mobil 1, seems by about 1/2 quart, estimated.
And it started knocking on cold starts. For the first 30 - 45 seconds or so.
My engine leaks oil so I think it will be self-remediated shortly.

 

[mrsilv04]

My guess is a lifter is going bad. It's a 15 year old 5.3, with AFM, with 250,000 miles.

 

[pacem]

Do I need to remediate it and how bad/dangerous is it? No knocking under load thus far or any usual performance.

 

[bullwinkle]

Try a new filter, you’ll lose 1/4 to 1/2 a quart, and hopefully the ADBV is better than the one you have on there now.

 

[Warstud]

I overfilled the engine with oil, Mobil 1, seems by about 1/2 quart, estimate

Mobil 1 can be noisy at startup. Have you used it before ? It could also be the filter if your using a different brand than you normally do.

 

[pacem]

Just installed a new Purolator Pure 1 and I usually don't change the filter every time I change oil. Lately it has been one oil change per year, or when I feel like it.

 

[pacem]

Mobil 1 is all I've used on cars in the last 20 years.

 

[PimTac]

Did you dump that Lucas stuff in ?

Lucas transmission fix for lubrication

I got some Lucas transmission fix that I don't need for transmission purposes, wondering if I can use it for lubrication instead. It's thicker than conventional oil. I've used Mobil 1 with great success, sometimes mixing it with transmission fluid, sometimes with a bit of great for my own...

bobistheoilguy.com

 

[Merek]

I know the 5.3 is famous for piston slap but don't know exactly which years were affected but haven't experienced it with mine which is an '04 w/ around 120k miles. If it's a stuck lifer you can try adding a quart of MMO to help free it up, using synthetic oil it's most likely not needed but that stuff does do wonders for lifters.

I seriously doubt overfilling by that much caused any real damage.

 

[pacem]

Did you dump that Lucas stuff in ?

Lucas transmission fix for lubrication

I got some Lucas transmission fix that I don't need for transmission purposes, wondering if I can use it for lubrication instead. It's thicker than conventional oil. I've used Mobil 1 with great success, sometimes mixing it with transmission fluid, sometimes with a bit of great for my own...

bobistheoilguy.com

Nope, decided to just change the fluid completely at some point in the future.

 

[PimTac]

Nope, decided to just change the fluid completely at some point in the future.

Changing the filter would be a good start. You might have gotten a bad one. That would decrease the overfill in the process too.

 

[pacem]

I installed fresh M1 synthetic a week ago, forget which weight and a new Purolator Pure One. That's when I overfilled it a bit.
I plan to change the transmission fluid in the future.

 

[wpod]

Half a qt over won't hurt.

 

[aquariuscsm]

Is it knocking or ticking?

 

[tblt44]

I would drain a bit ut

 

[Merek]

Did you use the PL12222 filter? Just making sure you used the right Purolator filter.

I've used Purolator filters over the years from the regular ones and Pure One and have had no issues whatsoever with them, they are usually my go-to filter after OEM.

 

[bullwinkle]

Knocking would be bad, that sounds like the filter is completely draining, along with the galleries above it. Does the oil pressure light stay on, for more than a second? The LS engines have the sensor up top, so if everything drains out, it may take a few seconds to build pressure back up again. 30-45 seconds is way too long!

 

[travis8352]

Could be piston slap. My 04 silverado did that for 30-45 seconds on a cold start with 5w30 m1 ep hm at 240k

 

[demarpaint]

Half a quart over is not why the engine is knocking. Try a different brand filter and see if that helps.

 

[DuckRyder]

Half a quart over is not why the engine is knocking. Try a different brand filter and see if that helps.

Right.

I would change the filter.