changing coolant

How long did you leave in ?

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The reason I ask is if you are leaving in too long maybe that is iron is rusting .. not sure what would be iron in the coolant system but that would make the most sense ..when I do what you do .. I try to do in the course of a day .. glad you are done

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That Rotella should last around 5 years before the additives start going. None of them last longer than that according to the manufacturers.

 

where do you get the shell coolant from ?

 

Napa , Walmart.com , Amazon .. I believe some advance Auto or AutoZone may carry it depending location

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thanks

 

thanks for that tip didn't know it came in different colors

 

Some interesting "edumacation" on coolant from Rock Auto...

Coolant/Antifreeze for Your Specific Vehicle
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Engines built during the previous century almost universally used inorganic acid technology (IAT) coolant/antifreeze. Most newer vehicles use either longer lasting organic-acid inhibitor (OAT) coolant or hybrid organic acid technology (HOAT) coolant that offers both the corrosion resistance of IAT and the long life of OAT. To reduce gunk formation and maximize coolant life, it is best to not mix IAT, OAT and/or HOAT coolants together.

IAT, OAT and HOAT coolants are all usually ethylene glycol-based, but they contain different additives. Coolant manufacturers' bottle labeling can be confusing if it includes a "Does NOT contain..." statement that could make it appear a traditional IAT coolant additive is inherently bad rather than just not the right additive (or quantity of additive) for that particular OAT or HOAT coolant. Reading "Does NOT contain..." could actually mean you should find a different coolant that "Does contain..." for your particular engine.

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Coolant that does not contain...
Here are the benefits and/or drawbacks for some of the most common coolant additives mentioned on the coolant/antifreeze bottle labels:

Amine: Amine was used to help prevent ferrous (iron) corrosion. In the '70s, it was found to react with nitrite, forming a carcinogenic substance, nitrosamine. Amine is no longer used in automotive coolant and "Does NOT contain Amine" is true even when unsaid.

Borate: Borates have long been used to reduce acidity (pH) in IAT coolants. It is not compatible with some OAT and HOAT coolants that must maintain a different pH.

Nitrite: Nitrite is used in coolant for heavy duty diesel and other engines to help prevent corrosion and pitting caused by cavitation (foaming bubbles). Nitrites oxidize aluminum and are generally not compatible with aluminum engines and cooling systems. Some coolants include both nitrites and additional additives that protect aluminum from oxidation.

Phosphate: Phosphate is used to prevent corrosion in many IAT coolants. It coats metal preventing corrosion, but that coating can eventually flake off or form layers of scale, clogging the cooling system passages. Therefore, IAT coolants must typically be changed more frequently. Scale formation is a bigger problem if hard-water rather than distilled water is mixed with the coolant. Europe has lots of hard-water (and apparently little distilled water) so phosphate containing coolants are not used in most European brand vehicles. On the other hand, Asian vehicle manufacturers actually prefer coolant with phosphates and HOAT coolants designed for Asian brand vehicles usually include some phosphate.

Silicate: Silicate is used in IAT coolants for corrosion protection, especially for aluminum. Asian vehicle manufacturers decided silicates are bad for water pump seals and reduce heat transfer. Therefore, coolants for most newer Asian brand vehicles do not contain silicates. On the other hand, European vehicle manufacturers think silicates are great for protecting aluminum from corrosion and HOAT coolants for European brand vehicles usually include silicates.

So, in summary, HOAT coolants may contain nitrate, phosphate and/or silicate depending on what engines the coolant was designed for (Asian brand engines get phosphate, European brand engines get silicate). OAT coolants, such as Dex-Cool for GM vehicles, and coolants claiming they work in "all makes, all models, all colors" might not use any of the above additives, but instead rely on acid salt molecule coating and/or proprietary additives to prevent corrosion.

 

After all the Dex-Cool warnings and the similar issues with (orange) OAT in Astons, we switched them over to GO5 (HOAT). Put this in the 550 last time as well. GO5 has been used by Mercedes for years with no issues; however a two year change cycle is recommended by my former independent. Readily available everywhere. We think the 550 came with Audi spec antifreeze from the previous owner...

 

Mercedes switched to G48 several years ago, but their engines do not have wet liners. G05 was only recently switched over from nitrited IATs to nitrited HOATs. I used a two year cycle on the old G05 and will continue to do so on the new formulation.