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Discussion Starter #1
I was reading in this forum about the type of Antifreeze/Coolant used for 1986 Spider Veloce.
Some said that prestone can be used. I have premixed Prestone, that I also have used in my Japanese cars. Can I use the premixed Prestone Antifreeze/Coolant for my 1986 Spider? If not, what kind you guys recommend?

Thank you
 

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But Mad North-Northwest
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Prestone is now an OAT (Dex-Cool, basically) coolant. There are some concerns about how well OAT coolants protect older cars that have brass & lead solder in the cooling system, and about compatibility with older seals. How valid these concerns are in practice I do not know.

Alfa spec'd IAT (conventional green) coolant. This is still readily available, typically as a store brand at your local auto parts store.

I used Prestone in the Spider and Milano and didn't note any issues, but because of the above I've since switched back to the conventional stuff. The only downside of the green stuff is that you should probably change it every two years.
 

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Highly recommend VW G20 spec (pink) mixed with distilled water. Add bottle of “water wetter” for more chemical action.

Check your hoses are not rotting inside out.

This mix of iron liners and aluminum engine is a unique combination of rebuild possibilities.
 

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But Mad North-Northwest
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VW G20 isn't a thing. VW G12 is pink, and it's OAT Dex-Cool the same as Prestone. Current spec G13 is violet and is a HOAT coolant.

Water wetter doesn't do very much at all when added to coolant.
 

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Prestone has a range of about 10 different products on the market. Some are OAT, some are more traditional. I've been using the regular one ever since it was the only one available, and never had a problem.

Back in the day, the coolant available in North America was great to prevent freezing, but did not contain inhibitors to protect aluminum as it was unheard of in Detroit's production. Alfa owners manual recommended flushing the system once a year and filling it with a water/sodium bicarbonate and running it for 15 minutes to coat the inner surfaces and prevent corrosion. I used to do it. Then the K-cars and Escorts appeared and the coolant companies adapted.

Neglecting coolant has consequences. A friend bought a "garage find" Gt Junior from the daughter of the original owner. Great looking, not run in 40 years. The engine was stuck, taking the liners out was quite a job, only to find out... that corrosion had made the block porous.
 

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So if it's OAT it's not green right? I need to do a coolant change and Prestone is usually my go-to. If it's green (like what's in it now) it's OK, right?
 

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Prestone generic "extended life" coolant is what you need. Their Dexcool substitute is clearly labeled as such. They have other chemistries specifically for some Japanese brands and for "European cars", avoid those as well.

Around here prediluted coolant sells for not much less than concentrate... half coolant, half distilled water. A gallon of distilled water costs $2.

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