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preventative maintenance on high miler 5.7 #2913328
04/22/21 10:01 AM
04/22/21 10:01 AM
Joined: Apr 2007
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Calgary, Alberta Canada
a12rag Offline OP
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Question for the learned masses here . . . . if you have totally stock, 5.7 with NO ISSUES other than high mileage . . .would you take preventative measure and replace timing chain, guides & tensioners ?? Or continue to just drive the car ?? Have 139k miles on my 2006 magnum, have NEVER had issues with 5.7, not even valve cover gaskets !!. . . so wondering if should think of preventative maintenance items prior to having issues.

Re: preventative maintenance on high miler 5.7 [Re: a12rag] #2913331
04/22/21 10:11 AM
04/22/21 10:11 AM
Joined: Apr 2003
Posts: 3,496
Tulsa, Oklahoma
340Cuda Offline
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I have a 2007 Magnum R/T with a 5.7. I has 180,000 miles.

At 100,000 I had the transmission and the cooling system serviced.

I also replaced the spark plugs at 100,000.

I have replaced the batteries every five years or so.

Fairly recently I had the serpentine drive belt and hoses replaced.

I change the oil and filter every 10,000 miles normally with Mobil 1.

It still seems to be going strong.

I don't drive it now near as much as I used to and I will probably go to annual oil changes without regard to the mileage.

Re: preventative maintenance on high miler 5.7 [Re: 340Cuda] #2913448
04/22/21 02:29 PM
04/22/21 02:29 PM
Joined: Apr 2007
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Calgary, Alberta Canada
a12rag Offline OP
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Thanks, yes, my car gets oil changes every 3k miles, plugs every 30k miles, changed belt once, still on original battery - yup, still tests good ! Replaced the belt once, tranny serviced once, cooling system serviced couple times, including new rad, cap and t-stat . . . but I am more concerned about the internal wear items like the timing chain (which is fairly long), chain guides (plastic ??) and guide tensioners . . . think that even with regular oil changes, these wear items are just that wear items . . .

Re: preventative maintenance on high miler 5.7 [Re: a12rag] #2913464
04/22/21 02:51 PM
04/22/21 02:51 PM
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Granite Bay CA
Kern Dog Offline
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I have 356,000 on the 5.7 in my truck.
Oil changes and spark plugs are done on a regular schedule.
I replaced an EGR valve, a thermostat and that is it. Original water pump, alternator....even the serpentine belt is original!

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Re: preventative maintenance on high miler 5.7 [Re: Kern Dog] #2913586
04/22/21 07:29 PM
04/22/21 07:29 PM
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Central Pa
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moparjim79 Offline
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Don't phuck with it.

Re: preventative maintenance on high miler 5.7 [Re: moparjim79] #2913942
04/23/21 02:34 PM
04/23/21 02:34 PM
Joined: Jan 2003
Posts: 10,498
Chicago, Illinois
Devil Online penguin-006
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Chicago, Illinois
My 09 Challenger R/T with 228,000 miles on it. Nothing leaks, nothing squeaks. I have had to do routine maintenance, but that's about it. Never been under the valve covers.

Re: preventative maintenance on high miler 5.7 [Re: a12rag] #2913953
04/23/21 03:06 PM
04/23/21 03:06 PM
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Kalispell Mt.
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HotRodDave Offline
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For one thing, 139,000 is nowhere remotely close to something called high mileage. 15,000 per year is average and on a 15 year old car should be 225,000. Even if it did have 225,000 miles I would not touch the timing chain unless I always ran way over on my oil changes and there was a lot of sludge in the engine and in that case you would probably have worse problems any how.

As for what maintenance I would do above and beyond what is regularly scheduled I would very closely inspect the water pump weep hole and bearing with the belt tension off, and radiator especially along the seams, they are both prone to develop leaks and one good overheat will cause valve seats to drop out. Heck if I was very concerned bout it I would just throw in a high quality pump and radiator and don't worry about it.


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Re: preventative maintenance on high miler 5.7 [Re: HotRodDave] #2914441
04/24/21 06:27 PM
04/24/21 06:27 PM
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Calgary, Alberta Canada
a12rag Offline OP
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a12rag  Offline OP
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Rad replaced and no issue with water pump weeping . . .

Re: preventative maintenance on high miler 5.7 [Re: a12rag] #2914564
04/25/21 12:56 AM
04/25/21 12:56 AM
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog Offline
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My engine loses a bit of coolant over time. I suspected the water pump but in every other water pump that I had go bad in the past, it never just weeped and stopped, weeped and stopped like this one. Before, once they started to drip, it was only going to get worse so I replaced the pump.

Re: preventative maintenance on high miler 5.7 [Re: Kern Dog] #2914754
04/25/21 01:20 PM
04/25/21 01:20 PM
Joined: Jan 2011
Posts: 15,713
Central Florida
larrymopar360 Offline
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Central Florida
There was a "Customer Satisfaction Bulletin" (Not a recall) on timing chain tensioner in which they will replace chain and tensioner for free. It was because of the plastic tensioner itself. Could cause serious damage if it crumbled apart. Did you have that done? If not, might as well have that done. Otherwise, I'd just continue with the oil changes and DEFINITELY do coolant drain and fresh coolant/distilled water refill. Aluminum parts need the clean coolant and distilled water or electrolysis will eat a hole right through parts. I saw a timing chain cover that almost had two holes through it due to poor cooling system maintenance on a 5.7 police car 98,000 miles. Granted, lots of idle time too but don't take a chance on that.

Other than that, nothing else unless you want to do stuff so you don't end up on the side of the road and inconvenienced. I did hoses, serp belt and pulleys, thermostat with flush at 75k but it's police package and has enough idle hours to consider it around 100k miles. I have not change plugs because it runs well.

Looking further, that might only be on Eagle Head Hemis starting in '09 but I'd still check it out.

Last edited by larrymopar360; 04/25/21 01:39 PM.

Facts are stubborn things.
Re: preventative maintenance on high miler 5.7 [Re: Kern Dog] #2914764
04/25/21 01:40 PM
04/25/21 01:40 PM
Joined: Jan 2011
Posts: 15,713
Central Florida
larrymopar360 Offline
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Central Florida
Originally Posted by Frankenduster
My engine loses a bit of coolant over time. I suspected the water pump but in every other water pump that I had go bad in the past, it never just weeped and stopped, weeped and stopped like this one. Before, once they started to drip, it was only going to get worse so I replaced the pump.
Same here. Lasted a long time though, including lots of idle hours but never dripped. Another work car made lots of awful noise but didn't drip.


Facts are stubborn things.






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