Engine coolant

[pmac]

From their site:

Evans NPG is the Original Waterless Coolant. NPG is a lifetime coolant. NPG is recommended for racing engines that run on tracks or in series where there is a "NO Ethylene Glycol" rule, and can be used in high performance street vehicles with high flow cooling systems.

[drover]

Never had any problem with a $35 bottle of Nulon and a bit of tank water mixed in for alloy engines and with the good old cast stuff I always used 2 tins of Castrol Soluble Oil with tank water, great stuff, galleries look like new even after 200,000Km.
$150 plus is a bit much, one bad clamp or dicky hose and it's on the ground.

[bodgie]

This is what the manual says:

Coolant flows through the engine water jackets and cylinder heads absorbing heat produced by the engine during operation. The coolant carries heat to the radi- ator and heater core. Here it is transferred to ambient air passing through the radiator and heater core fins.

The required ethylene-glycol (antifreeze) and water mixture depends upon the climate and vehicle oper- ating conditions. The recommended mixture of 50/50 ethylene-glycol and water will provide protection against freezing to -37 deg. C (-35 deg. F). The anti- freeze concentration must always be a minimum of 44 percent, year-round in all climates. If percentage is lower than 44 percent, engine parts may be eroded by cavitation, and cooling system com- ponents may be severely damaged by corrosion. Maximum protection against freezing is provided with a 68 percent antifreeze concentration, which prevents freezing down to -67.7 deg. C (-90 deg. F). A higher percentage will freeze at a warmer tempera- ture. Also, a higher percentage of antifreeze can cause the engine to overheat because the specific heat of antifreeze is lower than that of water.

100 Percent Ethylene-Glycol—Should Not Be Used in Chrysler Vehicles
Use of 100 percent ethylene-glycol will cause for- mation of additive deposits in the system, as the cor- rosion inhibitive additives in ethylene-glycol require the presence of water to dissolve. The deposits act as insulation, causing temperatures to rise to as high as 149 deg. C (300 deg. F). This temperature is hot enough to melt plastic and soften solder. The increased temperature can result in engine detona- tion. In addition, 100 percent ethylene-glycol freezes at -22 deg. C (-8 deg. F ).

Propylene-glycol Formulations—Should Not Be Used in Chrysler Vehicles
Propylene-glycol formulations do not meet Chrysler coolant specifications. It’s overall effec- tive temperature range is smaller than that of ethyl- ene-glycol. The freeze point of 50/50 propylene-glycol and water is -32 deg. C (-26 deg. F). 5 deg. C higher than ethylene-glycol’s freeze point. The boiling point (protection against summer boil-over) of propylene-gly- col is 125 deg. C (257 deg. F ) at 96.5 kPa (14 psi), compared to 128 deg. C (263 deg. F) for ethylene-gly- col. Use of propylene-glycol can result in boil-over or reeze-up in Chrysler vehicles, which are designed for ethylene-glycol. Propylene glycol also has poorer heat transfer characteristics than ethylene glycol. This can increase cylinder head temperatures under certain conditions.

Propylene-glycol/Ethylene-glycol Mixtures—Should Not Be Used in Chrysler Vehicles

Propylene-glycol/ethylene-glycol Mixtures can cause the destabilization of various corrosion inhibitors, causing damage to the various cooling system compo- nents. Also, once ethylene-glycol and propylene-glycol based coolants are mixed in the vehicle, conventional methods of determining freeze point will not be accu- rate. Both the refractive index and specific gravity dif- fer between ethylene glycol and propylene glycol.

[HighOutput]

I emailed Mopar asking if it's ok to use Nulon Long Life, they never got back to me so I've been using Nulon long (4.7L) with no probs. 50/50 mix

[briteway]

Originally Posted by HighOutput

I emailed Mopar asking if it's ok to use Nulon Long Life, they never got back to me so I've been using Nulon long (4.7L) with no probs. 50/50 mix

^^^ That's the same one I used.

[holbi]

The Nulon Long Life Coolant is HOAT, so meets Chrysler Jeep requirements and is much cheaper too.

[briteway]

Here it is. Nulon HOAT coolant on sale at SCA and you get another free 1L bottle with it. Sale ends on 21st Dec 12.