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Adding Coolant to 991.1

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Old May 22, 2024 | 05:03 PM
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Default Adding Coolant to 991.1

I just completed my 80.000 mile service. Went fine.

However, I neglected to secure the coolant cap and lost maybe a cup when I parked the car on overflow after testing. Scared the heck out of me.

My coolant dipstick is at the min level. Car runs fine, no high temps or lights.

Can I simply add a cup to the reservoir to bring it between min and max? The operating manual seems to indicate it's OK to do this, but the Pelican Parts site DYI says never add in this manner as it is a vacuum system. Have no experience with that.

I tried searching but there was nothing definitive.

Appreciate any help.

Regards,

Drew
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Old May 22, 2024 | 05:16 PM
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Add a cup of distilled water. If you need much more than that you should mix 50/50 with the correct coolant. Info should be in your manual.
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Old May 22, 2024 | 06:04 PM
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Where are you located?

I'd just source the correct coolant. Porsche, VW or a good local auto part store should be able to help you out.
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Old May 22, 2024 | 06:18 PM
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Yes unlikely to have created sizable air pockets, just add distilled water or coolant. If you get any issues with temp you can worry about vaccum fill.
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Old May 22, 2024 | 06:20 PM
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Originally Posted by CSK 911 C4S
I'd just source the correct coolant.
Valvoline Zerex G40.
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Old May 23, 2024 | 03:17 PM
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I'm in Tuscaloosa, AL

Advanced Autopart has PentosinPentofrost SF (G12+) OAT concentrate. Is that compatible?

My car is a 2014 model.
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Old May 23, 2024 | 03:28 PM
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Adding coolant to top things off will in no way introduce air, nor do you need to use the vacuum method. That's why the reservoir cap is there ! Just pour in !

If you're refilling the entire system, or have lost a large amount of coolant, etc.. yes, vacuum fill is the way.

Last edited by Nashvegas; May 23, 2024 at 03:29 PM.
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Old May 23, 2024 | 05:27 PM
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Originally Posted by DrewAltemara
Advanced Autopart has PentosinPentofrost SF (G12+) OAT concentrate. Is that compatible?

My car is a 2014 model.
Look it up on their web site. I know for a FACT that Valvoline ZEREX G40 is, but you should check it out on their site as well. Originally BASF GLYSANTIN.
Approval code TL 774-G.

BASF GLYSANTIN G40
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Old May 23, 2024 | 09:57 PM
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Originally Posted by DrewAltemara
I'm in Tuscaloosa, AL

Advanced Autopart has PentosinPentofrost SF (G12+) OAT concentrate. Is that compatible?

My car is a 2014 model.

No you need G13 with the purple/violet cap.

https://crpautomotive.com/wp-content...ntofrost-E.pdf
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Old May 25, 2024 | 12:46 PM
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Thanks for the help folks.

The local O'Riley's did carry Valvoline Zerex G40 and that is what I topped up with.

So far so good.

Drew
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