W211 AMG Discuss the W211 AMG's such as the E55 and the E63

Anybody use Royal Purple Coolant?

Old Sep 13, 2013 | 02:30 PM
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2006 E55
Anybody use Royal Purple Coolant?

I was talking to my boss earlier today (he drives a newer 5.0 Mustang that he recently supercharged) and he said he used Royal Purple coolant and his temps dropped substantially and the car felt stronger overall since the addition. I'm thinking it might be a placebo, but he was adamant that his temps were lower.


Anybody ever use the RP Coolant? Pros? Cons?

Last edited by ArmoE55; Sep 13, 2013 at 03:06 PM.
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Old Sep 13, 2013 | 03:05 PM
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nope I run 3 gallons of distilled water and 2 gallons of MB coolant in my trunk tank and just MB coolant in the front reservoir
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Old Sep 13, 2013 | 03:39 PM
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2005 E55, 2011 Honda Push Mower (21 inch deck bishes)
I'm in Florida, so I always run Distilled Water and a bottle of Water wetter for my intercooler systems (no "antifreeze"), and Distilled, Water-Wetter, and OEM recommended coolant in the main system.
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Old Sep 13, 2013 | 04:07 PM
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Unless you can guarantee that RP is the same "type" of coolant as Zerex G-05, then I wouldn't risk it. You never know what kind of deposits you could build up by using the incorrect coolant. This isn't like the old days when you could just throw the green stuff in there.
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Old Sep 13, 2013 | 05:20 PM
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+1 on the Zerex G-05.
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Old Sep 13, 2013 | 05:39 PM
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Zerex G-05

Is this the MB/OEM coolant used in our cars?
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Old Sep 13, 2013 | 06:17 PM
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is it purple?
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Old Sep 13, 2013 | 06:18 PM
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Originally Posted by ArmoE55
Zerex G-05

Is this the MB/OEM coolant used in our cars?
Yes, it's yellowish-gold.
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Old Sep 13, 2013 | 11:15 PM
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Cant go wrong with OEM. Lot of engineering sweat went into this. MB would be recommending RP if any gains.
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Old Sep 14, 2013 | 12:11 AM
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Originally Posted by typhoon43
I'm in Florida, so I always run Distilled Water and a bottle of Water wetter for my intercooler systems (no "antifreeze"), and Distilled, Water-Wetter, and OEM recommended coolant in the main system.
yeah, i'm with beaker on this
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