#Subaru coolant manuals#

Hybrid OAT coolants add some silicate to provide quick-acting protection for aluminum surfaces. Hybrid OAT (HOAT) coolants, such as 'Zerex G-05¨.' Use organic acids, but not 2-EHA (2-ethylhexanoic acid) (different organic acids are used). OAT coolants also have extended lives, up to 150,000 mi.

OAT is recommended in engines with aluminum components (heads or radiators) such as Subarus and VWs because Borates can be bad for them.

The new antifreezes or Extended Life Antifreeze Coolant (XLC or ELC) use Organic Acid Technology (OAT) containing neutralized organic acids (organic acid salts) that protect engine parts from corrosion instead of the inorganic inhibitors such as silicates, phosphates and / or borates in the old (green and yellow) antifreezes. The new extended life coolants from Zerex, Prestone. Most experts agree you don't have to use the manufacturers coolant. Always use SUBARU Genuine Coolant, since other coolant may cause corrosion.' 'The SUBARU Genuine Coolant containing antifreeze and anti-rust agents is especially made for SUBARU engine, which has an aluminum crankcase.

#Subaru coolant manuals#

Many of the owner's manuals will say something like Subaru's: So manufacturers started selling proprietary formulas in a variety of colors other than the traditional green and specifying that you use their brand, which was, of course, more expensive. The europeans (VW, BMW) didn't like phosphates because of the reaction of their hard water with phosphates The Japanese (Honda, Toyota) on the other hand liked phosphates because they worked better than borates. Some were hybrids with combinations of the new organic acid technology (OAT) and old ingredients like phosphates. ) manufacturers started using extend life coolants with different anti-corrosives for longer life (because people neglected to change it every two years). Overview | Components | Color Table | Flushing | VW/Audi | Other notes | VW | Subaru | Standards | Links OverviewĮvery two years you flushed your out your old coolant and replaced it with new you got from your auto supply store. Coolant/Antifreeze Don's Home Home & Garden Cars Maintenance Coolant/Antifreeze Contact