I've never seen this under oil fill cap

[rybern]

If you can get to a shop with a gas analyzer then have them check with a cold engine start up and as it warms up. By check I mean have the rad cap off and use the sniffer at the rad neck and check for hydro-carbons. If they are there then that is a sure sign of head/gasket problems. The pic looks excessive. I have seen just a small amount of the white milky foam just under the fill cap but what I see in that pic definitely looks like more than just the short trip/cold start condensation problem. I am leaning toward the heads problem but the gas analyzer should help narrow it down.

I wonder how bad the dealer would beat me up to test that. I have an appointment to have my drive seat module reprogrammed. I may check on them testing that.

 

[OR VietVet]

They would probably want to charge you their minimum fee for the use of the machine. Most shops will do it for $20-$30 or free if they do the work needed. All you can do is ask at the dealer but no matter what, be prepared for the dealer to tell you the worst possible news.

 

[rybern]

Your probably right Ron. I think I'll avoid the dealer on this matter.

 

[memphisrains423]

Pull your valve covers. Looks like the CasTech curse to me.

 

[Mr. 960]

Don't ingest it but a simple "taste" of the froth will tell if it contains glycol. If it does then it's not condensation and time to pull the engine apart. I've used this method numerous times.

I think due to obvious reasons they no longer put glycol in antifreeze.

Mr. 960

 

[chevync]

This was my cover with just under 3k miles after what was suppose to have been a complete engine rebuild, the heads pasts the cold test after heads were shaved, I had the chemical test done and it came back antifreeze in the heads.

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[rybern]

Wow. I think I'm going to pull the valve covers and search this sight for info on what heads to get (if needed).

I really appreciate you guys jumping in and helping.me out on this.

 

[chevync]

Wow. I think I'm going to pull the valve covers and search this sight for info on what heads to get (if needed).

I really appreciate you guys jumping in and helping.me out on this.

I went with a set of 862 heads.

 

[rybern]

I have 862's. I guess some 862 's are not the dreaded Castech.

 

[chevync]

It's a pretty big problem with Castech 706 and 862s. GM had a TSB on it that covered 5.3L from 01-06.