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Old 01-07-2011, 11:40 AM   #1
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What weight antifreeze?

I need to refill my tank as the engine runs hot and I am almost empty. What weight and brand of antifreeze should I use for my 1987 345 with a Chevy 454 engine?
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Old 01-07-2011, 11:54 AM   #2
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That should take regular off the shelf Prestone recomended for GM. I used that and added a can of super coolant from NAPA. It dropped my summer operating temps to a lower level. Even in 100 degree heat.

It is a good idea to check the thermostat and to backflush the system if you can. There are easy back flush attachments you can put into the heater hoses, also form Prestone.
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Old 01-07-2011, 01:00 PM   #3
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Thank you for your help!
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Old 01-07-2011, 01:10 PM   #4
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Mix 50% with clean water
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Old 01-07-2011, 01:11 PM   #5
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Is your water tank low regularly? Might also be a good time to check for leaks.
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Old 01-07-2011, 02:09 PM   #6
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Is your water tank low regularly? Might also be a good time to check for leaks.
New radiator in Fall 2009. Only use it to go back and forth to the repair shop. LOL!
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Old 01-07-2011, 09:09 PM   #7
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Only use it to go back and forth to the repair shop. LOL!

That's a good one!!
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Old 01-08-2011, 10:03 AM   #8
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I need to refill my tank as the engine runs hot and I am almost empty. What weight and brand of antifreeze should I use for my 1987 345 with a Chevy 454 engine?
Try 10w-30.
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Old 01-08-2011, 10:35 AM   #9
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Try 10w-30.
Do you know anyone in Phoenix that works on mid weight trucks?
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Old 01-08-2011, 01:02 PM   #10
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There's a great guy in Tucson, if yer radiator can handle the trip...AZ Mobile Mechanic...his name is Tom, and if you want to try him, pm me, and I'll send you the particulars...mike
Just noticed this was post 454, and we have one...!!!
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