Planet-9

Permanent coolant?

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YOUR RESEARCHPermanent coolant?

Leading reported evidence

Check coolant level at least monthly

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Suggestion
cooling system has such a long, complex circuit there could be very minor leaks just about anywhere under that chassis tray, and you'd never know it, so I recommend checking the coolant level at least monthly.
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Permanent coolant?

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Leading evidence: 'Check coolant level at least monthly' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check coolant level at least monthly' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Replace coolant

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Suggestion
I was always taught that heat breaks down Ethylene Glycol over time, so that even if you have an engine and radiator made from aluminum and plastic you still need to change the coolant after 3-5 years.
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Permanent coolant?

Replace coolant about every three years

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Suggestion
Also, I'm going to change my coolant about every three years.
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Permanent coolant?

Replace interval

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Suggestion
goes even a step beyond MB and says the coolant is the "permanent type", and there isn't a recommended change interval.
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Permanent coolant?

Frequently discussed actions (4)

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Check coolant level at least monthly

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion
cooling system has such a long, complex circuit there could be very minor leaks just about anywhere under that chassis tray, and you'd never know it, so I recommend checking the coolant level at least monthly.
Original post Read captured discussion
Permanent coolant?

Replace coolant

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion
I was always taught that heat breaks down Ethylene Glycol over time, so that even if you have an engine and radiator made from aluminum and plastic you still need to change the coolant after 3-5 years.
Original post Read captured discussion
Permanent coolant?

Replace coolant about every three years

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion
Also, I'm going to change my coolant about every three years.
Original post Read captured discussion
Permanent coolant?

Replace interval

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
goes even a step beyond MB and says the coolant is the "permanent type", and there isn't a recommended change interval.
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Permanent coolant?

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2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

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Generation: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

I thought it was weird when I read my Mercedes owners manual and saw that the coolant was good for 143,000 miles. I ignore Mercedes on every other service interval, so why not coolant too? But then I read the Cayman 's owners manual and Porsche goes even a step beyond MB and says the coolant is the "permanent type", and there isn't a recommended change interval. Porsche coolant is apparently forever. I don't buy it. I find it especially disconcerting that a company that specialized in air-cooled engines for decades becomes the first auto manufacturer (that I'm aware of) to introduce permanent coolant. Since Porsche says you can top off the coolant with water I assume they used one of the Ethylene Glycol variants. I was always taught that heat breaks down Ethylene Glycol over time, so that even if you have an engine and radiator made from aluminum and plastic you still need to change the coolant after 3-5 years. I'm curious - why is the Cayman different?

POST 2Original post

Well, just to top off my CS, I bought a gallon of the super-duper, "permanent-type" coolant from Sunset Porsche . There's nothing magic about this stuff. It looks like a typical ethylene glycol / diethylene glycol, non-silicate coolant. ( BMW , for example, sticks to silicate type, so don't interchange usages.) The non-silicate, or Organic Acid Technology (OAT), coolants, theoretically last longer than the silicate types, but I'm not comfortable leaving that coolant in my CS forever. One thing is CERTAIN - don't let your coolant get low. Keep it topped off. The Cayman cooling system has such a long, complex circuit there could be very minor leaks just about anywhere under that chassis tray, and you'd never know it, so I recommend checking the coolant level at least monthly. Also, I'm going to change my coolant about every three years. No way am I believing in "permanent". If you lease or trade often, never mind. I'm guessing a Cayman coolant flush is an expensive PITA (though I don't know the procedure yet).

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