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#1
09-14-2025, 10:36 PM
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Antifreeze/Coolant Change Intervals
I have a question for you guys that I'm sure have more experience than me related to car things. I have a 1978 K5 Blazer that I had the antifreeze/coolant changed in 2022 with Prestone's longer engine life coolant (10 year or 300,000 mile guarantee). Now I know I'm never going to approach 300,000 miles. My question is do you think this antifreeze/coolant would be alright to leave in for say 5 years? I've often heard that the anti freezing and anti boil over properties last for decades. It's what is added that wears out over time or mileage, such as anti-corrosives and lubricants that require the frequent changes. My owner's manual says to change the antifreeze/coolant every 2 years, but I'm sure today's are much improved over 47 years ago. I drive the Blazer no more than 500 miles a year.
What do you guys think? Any advice appreciated. 
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#2
09-15-2025, 12:03 AM
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| The Following User Says Thank You to Ralph Spears For This Useful Post: | ||
danachevroletfor1967 (09-15-2025) | ||
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#3
09-15-2025, 07:15 PM
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Quote:
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#4
09-15-2025, 08:17 PM
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.. You must be a young guy if you don't remember the can before they used plastic jugs price is $1.49
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| The Following 2 Users Say Thank You to Ralph Spears For This Useful Post: | ||
danachevroletfor1967 (09-16-2025), olredalert (09-15-2025) | ||
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#5
09-15-2025, 10:25 PM
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Speaking of old guys... I have these, left over from my dealership days.
To the OP's question, I agree with the 5 years rule.
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| The Following 3 Users Say Thank You to 67since67 For This Useful Post: | ||
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#6
09-17-2025, 09:58 PM
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Quote:
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#7
09-15-2025, 01:10 AM
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Myself, I would change it out after 5 years. It's not a hard job to do and not expensive
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| The Following 2 Users Say Thank You to frankk For This Useful Post: | ||
danachevroletfor1967 (09-15-2025), olredalert (09-15-2025) | ||
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#8
09-15-2025, 02:24 PM
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I’d at last drain out the Rad and replace, the coolant, there is water pump lube in the coolant that’s prob wore out. Plus a good time to clean up the overflow bottle too, I cane up,w/ a process to clean the inside nice.
__________________
It's only Orig once I spend a lot of money on Wine, Women and Cars, I waste all the rest. 1978 Y88 1995 Q45
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danachevroletfor1967 (09-15-2025), olredalert (09-15-2025) | ||
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#9
09-15-2025, 11:53 PM
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llll
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#10
09-16-2025, 12:20 AM
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FWIW - I drain and refill the radiators in the old cars every fall (just did the Chevelle last Saturday). I only put 200-400 miles on each car during the season. Only takes about 20-30 minutes for each car and I feel it's cheap insurance for heater cores and radiators. I use the concentrated anti freeze and distilled water mixed 50/50.
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