What is a good way to keep tires from dry rotting? - Mercedes-Benz Forum
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#1 (permalink) Old 06-15-2012, 01:06 PM
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What is a good way to keep tires from dry rotting?

I have tires (on another vehicle). They are 8 years old with only 35,000 miles on them. They are showing the beginning stages of dry rotting

Is there any good things on the market (spray or brush on) to slow down the dry rot process? Is Armor-All good for this, or is it just cosmetic?

A salesperson at Belle Tire Store says Armor-All looks nice, but is not good for the tires.

Any thought? The tires have a lot of thread left, but the side walls have the checking (on the outside). I will also treat the inside of the tires too, as there is probably checking there too.
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#2 (permalink) Old 06-15-2012, 03:39 PM
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The problem is oxidation, and it's happening inside the tire as well. Even if you can protect them from the sun, the air itself attacks the carcass (it does from the inside as well, but the insides have a coating to help reduce that; it's also one of the selling points of nitrogen fill).

But there is no actual solution I know of unless you're going to remove the tires and store them in a vacuum chamber. It's one reason I buy tires based on whether I can wear them out before they simply need to be replaced due to age.

One thing is for sure: once passenger tires show those signs, (especially at 8 years old!!) there is absolutely nothing you can do, and they are not safe to drive on. Maybe for short trips around town, but even at that (and from your description) my limit would be about 35 mph.

Good luck.

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#3 (permalink) Old 06-15-2012, 04:47 PM
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Formula 303 is one of few if not the only one proven to protect rubber and other surfaces from UV.
Most of the tire shines are speeding the tire aging.
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#4 (permalink) Old 06-16-2012, 01:24 PM
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I have a similar situation on some 6 year old tires with almost the same mileage. Plenty of tread (50%) but the sidewalls are showing their age. I have never treated them with anything and the Armor-All advice you were given is spot on. I'd just keep them clean and as CC wrote, don't trust them at highway speeds.

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#5 (permalink) Old 06-16-2012, 01:41 PM
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When parking at work or play, face the car east or west, use shades to protect the dash or rear window. The direct afternoon sun adds more problem on rubber.
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#6 (permalink) Old 06-16-2012, 04:36 PM
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Tire aging is one of the reason I started buying cheaper tires with only 50k threads not the Michelins I used to.
Dry rot can be due the fungi in wet weather of UV damage from sunshine. I always go extra way to protect my vehicles from the sun. Tires are smaller issue comparing to paint replacement I see some cars here need after 5-6 years. My cargo trailer is park on the sun, but the tires are covered from UV by piece of roofing.
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#7 (permalink) Old 06-17-2012, 10:35 AM
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More possible solutions to stop dry rot on older tires

What if I apply a coating of Silicoln Spray or perhaps spray lithium grease, or perhaps spray "fogging oil" ???? I'm just speculating on a possible solution. I'm not totally mad or I would have included WD-40 with my question.
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#8 (permalink) Old 06-17-2012, 10:58 AM
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Something I found on the internet regarding tire care.... feel free to read and comme

The problems associated with silicone based products may be broken down into the two catagories of usage, tires and vinyl: I have so many requests for this information, that I am posting to the entire list.

Tires/Rubber Trim: There are two main degrading agents that attack tires. They are UV light waves and ozone. Both of these attack the long hydrocarbon chains of the rubber and by breaking these chemical bonds, shorten the molecules with resulting loss of elasticity and other problems. Tire manufacturers add two primary sacrificial protectants to the rubber. To protect against UV, they add carbon black. This is why tires don't come in designer colors to match your paint. The carbon black will turn white/gray as it absorbs the UV and dissipates the energy as heat. Thus the basis of rubber parts turning gray as they age. To protect against ozone, tire manufacturers add a wax based sacrificial protectant. The ozone attacks the wax and depletes it. As the tire rolls, additional wax is forced to the surface of the tire. This is referred to as "blooming". This blooming refreshes the surface wax protectant. A tire that has not been flexed will have the wax depleted by the ozone and thus begin to degrade and suffer "dry rot". The silicone oil in Armour All et Al may actually dissolve the wax and be the cause of premature tire side wall cracking/failure. It is rumored that some tire manufacturers will not honor warranties on failures caused by silicone based products. I am in the process of checking with the major tire manufacturers to determine the validity of this rumor. In conclusion, any tire dressing should contain a UV protectant to bolster the efforts of the carbon black and preferably not contain any silicone.
Plastics/Vinyls: The dash, door panels, seat backs, and numerous other interior/exterior trim pieces are usually vinyl. Vinyl may be viewed as raw semi-liquid vinyls that are held in place by a solid vinyl "skin" (this description is for illustration only and not a PhD chemical dissertation ). The dash and other vinyl parts of your BMW are constantly bombarded by UV that breaks down the molecules of the skin, allowing the raw vinyls to escape (off-gassing). These vinyls then may deposit themselves on the glass, forming a haze that is difficult to remove. If you have such a haze, it is probably your dash that has decided to pick up stakes and migrate(back to Germany?). Silicone based products do not usually contain UV protectants, and the silicone may act as a magnifying glass, intensifying the UV degradation. Silicone oil may also dissolve the essential oils in the vinyl skin, hastening the premature formation of cracks in the vinyl skin. A quality vinyl protectant will contain a UV protectant and essential oils to replace lost oils from the vinyl. These protectants are expensive, so the K-Mart specials may do more harm than good. Silicone also has very strong electrostatic attraction which may be considered beneficial in that it will tend to stay where it is placed, but will also attract every dust particle in the surrounding three counties.

This list is my personal favorites. I am constantly testing new products and retesting old ones to compare their performance. We have a committee of 10+ people including national restoration and concours experts involved in these testing programs. Of these favorites, there are some that I personally like better than others. I have customers who will argue against my choices and defend their choice with equal vigor. When I am conducting work shops, I take a tire or two and divide them into sections and use all of the following products so people and see them side by side. Each person likes a different look, so each chooses a different product.

Tire/Rubber(spoilers, trim, bumpers, etc.) Care:

My favorite is Black Again with a top coat of Meguiar #42.
Black Again - is a white creamy polymer formulation the gives rubber a jet black color and a soft patena. My only problem with BA is that it doesn't last as long a I think it should. That is why I use the Meguiar #42 on top. This combo seems to really last. BA will also remove the white wax residue that you slopped on the rubber trim.
Meguiar #42 - is thick emulsion specifically formulated for black trim areas and tires. Will maintain the black patena without greasy shine. Does not restore color quite as well a Black Again.
Harly Tire Nu - many of the old time concour people use harlys. They love it. It maintains rubber for long periods of time and does not turn brown.
Meguiar #40 - This is supposed to be for rubber and vinyl - I feel that it works a lot better on vinyl.
Tony Nancy Vinyl/Rubber Care - This is a great product. Tony Nancy is a World class restorationist (Pebble Beach Class) and judge. This is his own brew. Does a great job on rubber. I only use it on the exterior as the smell will kill you.
One Grand Exterior Rubber - This is similar to the Harly product. Lots of people swear by it.
8.Zymol Vinyl - Better for vinyl than rubber. I think it is too much $, but many people love it. Be aware that Zymol has hooked up with Turtle Wax Co. to produce a new line of K-Mart crowd products with the Zymol name. I call them Zurtle Waxes. They are crap. They come in black or blue containers. I think it is Turtle Wax with pina colada mix thrown in. I got pre-release samples and tested them, hoping for a decent product at a reasonable price. Wrong!

9. Tire-Nu - This used to be a GREAT product. The original formula was made in Japan. They now make it in California for the K-Mart crowd and it stinks. They changed the formula to make it CHEAP. I bought up every case in the country when they discontinued importing it. I now own 2 cans for my personal use.

10. Formula 303 - A good product. It leaves a slicker finish than I care for, but some people love it.

11. Sonax or Wurth Rubber Care Spray - These are better suited for the rubber gaskets around doors, windows, etc. They rejeuvinate the rubber and help maintain the seal. Should be used twice a year.

12. Sonax PVC Maintenance Spray - A good product that is better for the hard rubber of spoilers and whaletails. Leaves a little more shine to the surface than I care for, but many people swear by it. Lasts a long time
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#9 (permalink) Old 06-17-2012, 11:32 AM
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I knew a mechanic a while back who swore on Vaseline.

My guy who services my sprinkler system at home also uses vaseline to lube my sprinklers to make sure they go up and down smoothly.
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#10 (permalink) Old 06-17-2012, 01:58 PM
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I always park my vehicle under shade which happened to be far away from the entrance to my work place, but still the same parking lot though. Colleagues ridicule me for that.
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