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Oil change w/ CC Zinc additive - 500m or next oci? #4698311
03/18/18 05:58 AM
03/18/18 05:58 AM
Joined: Jan 2017
Posts: 484
Virginia
Hemispheres Offline OP
Hemispheres  Offline OP
Joined: Jan 2017
Posts: 484
Virginia
I知 about nearing reassembly of my top end. Been one thing after another with this. Started as exhaust work turned stud extraction which then turned pulling the heads for metal chips. 2 head gaskets damaged in the mail, heads arrived with light scratches (found a nasty crack in an exhaust valve) which should be negligible with copper gasket spray. Machine shop turned my lower into scrap aluminum by rushing a gasket match/porting job out of the door asap.

I致e got the tools to port my own lower which looks simple enough if you port match. They say gasket matching is easier but you remove much more metal which makes it tricker.

My question is this: the company I got my reconditioned/rebuilt heads from only had #105 which are step above #90 LS6 style springs only in seat pressure. The website states the #90 springs have a higher spring rate.

While I知 in there I知 gonna replace all 12 pushrods. No new cam or lifters. I致e always read zinc additive is needed when breaking in stiffer springs.

What should I do after adding the additive? Change oil after 500-1000 or do my usual 6k? Current oil has only a few hundred miles but has been sitting with no heads since late December so I知 unsure of moisture accumulation.

Last edited by Hemispheres; 03/18/18 06:01 AM.

2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters
Re: Oil change w/ CC Zinc additive - 500m or next oci? [Re: Hemispheres] #4698409
03/18/18 07:52 AM
03/18/18 07:52 AM
Joined: Jan 2003
Posts: 1,518
Shippensburg, PA
novadude Offline
novadude  Offline
Joined: Jan 2003
Posts: 1,518
Shippensburg, PA
With a roller cam, I would not worry about the zinc addditive. I would recommend changing oil after 500 miles anytime you are deep inside the engine (head swap, etc). No matter how careful you are, there will be contaminants that get into the lifter valley, etc, not to mention the initial wear metals as parts get friendly with each other.

Re: Oil change w/ CC Zinc additive - 500m or next oci? [Re: Hemispheres] #4698525
03/18/18 10:02 AM
03/18/18 10:02 AM
Joined: Apr 2009
Posts: 242
Reno, Nevada
Langanobob Offline
Langanobob  Offline
Joined: Apr 2009
Posts: 242
Reno, Nevada
If you're determined to add the zinc additive, I'd drain and change the oil as soon as you pour the zinc additive into your motor.

Re: Oil change w/ CC Zinc additive - 500m or next oci? [Re: Hemispheres] #4698673
03/18/18 12:36 PM
03/18/18 12:36 PM
Joined: Jan 2017
Posts: 484
Virginia
Hemispheres Offline OP
Hemispheres  Offline OP
Joined: Jan 2017
Posts: 484
Virginia
I figured why not. I知 replacing pushrods because there is a lot of wear on the old set. I知 running aftermarket rockers and I saw a lot of wear up to. This despite me doing a 5 minute flush a few hundred miles after installing them. The engines been covered and stuffed with rags and I致e got the deck sealed off using pieces of cardboard wrapped in cling wrap, poked with holes for the head bolts to hold it in place. Every 3-7 days I reoil the piston rings, lube the cylinder walls and coat the deck and cylinders with WD40.

I知 draining the oil regardless to check it. If it doesn稚 appear to bad I知 going to run it just long enough to warm it up and get everything circulating before changing it.


2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters

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