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#4463150 - 07/18/17 06:08 PM Change oil twice after timing cover leak (coolant)
TmanP Offline

Registered: 10/30/15
Posts: 436
Loc: MN
In May, I had to replace the timing cover gasket (and water pump) on my 3.8 due to a coolant leak. My independent mechanic told me that I needed to have him change the oil after this, due to possible coolant contamination. So, I had him do that. Now, the VWB has 750 miles on it and I'm wondering if I need to re-change it ( I was thinking about just siphoning out 4 quarts and leaving the filter) or if it's okay as is. The coolant wasn't necessarily in the oil but there was a chance, as I understand it, that coolant and oil mixed (although the leak was external), and I had no "milkshake" oil. So, I was just wondering whether it should be good, or if there's any value in a change.
2006 Buick Lacrosse 3.8 V6 150,000 mi
2015 Chevy Silverado LT Z71 5.3 V8 30,000 mi
2010 Toyota Sienna 3.5 V6 150,000 mi

#4463153 - 07/18/17 06:12 PM Re: Change oil twice after timing cover leak (coolant) [Re: TmanP]
cjcride Offline

Registered: 11/06/09
Posts: 1815
Loc: Ontario Canada
You are fine. No to change again till next regular change.

Edited by cjcride (07/18/17 06:12 PM)

#4463175 - 07/18/17 06:46 PM Re: Change oil twice after timing cover leak (coolant) [Re: TmanP]
JamesBond Offline

Registered: 12/13/06
Posts: 843
Loc: midwest
For $20 and 1/2 an hour you can change the oil and not have to worry.

#4463179 - 07/18/17 06:51 PM Re: Change oil twice after timing cover leak (coolant) [Re: JamesBond]
demarpaint Offline

Registered: 07/03/05
Posts: 29792
Loc: NY
Originally Posted By: JamesBond
For $20 and 1/2 an hour you can change the oil and not have to worry.

That's what I'd do.
God Bless Our Troops

#4463195 - 07/18/17 07:05 PM Re: Change oil twice after timing cover leak (coolant) [Re: TmanP]
gathermewool Offline

Registered: 01/09/09
Posts: 6002
It's not Amsoil or some other expensive oil. I'd change the oil and leave the filter. If you've got a Fumoto valve installed it should take all of 5 minutes.

If you'd have to pay someone to do this, I'd wait.

#4463239 - 07/18/17 07:59 PM Re: Change oil twice after timing cover leak (coolant) [Re: TmanP]
Merkava_4 Offline

Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
If the mechanic drained the radiator before pulling the timing chain cover, I don't see the issue. Before pulling my intake manifold, I drained the radiator which drained everything else with it. I kept the oil in it because I had some very expensive Valvoline 5W-40 in it with low mileage.

#4463305 - 07/18/17 08:54 PM Re: Change oil twice after timing cover leak (coolant) [Re: TmanP]
CorvairGeek Offline

Registered: 09/07/06
Posts: 112
Loc: Idaho
So much coolant is still trapped in the block with everything removed, (unless you remove the block drains) I would change the oil (cheap insurance). I took the wet/dry vacuum and sucked out coolant from the ports just so it wouldn't weep during this job.

You can still see the coolant standing in the rear of the block. With the main oil galley through the timing cover (left side holes below coolant), it is good to be extra careful with the Buick engine. I was paranoid and even removed the oil pan (shockingly easy).

Edited by CorvairGeek (07/18/17 08:55 PM)