Modern coolants contain additives that coat the inside of the cooling system to prevent rust and corrosion. In time these additives become depleted or worn out. A worn out antifreeze/water mixture can cause severe corrosion and rust buildup inside your vehicle's engine coolant passages. This causes a contamination of the mixture that results in abrasive particles, electrolysis of metal parts, and acid formation. Radiators, heater cores, and cylinder coolant jackets can become clogged and restrict proper cooling. Electrolysis, acidity, and abrasion can etch, dissolve, and wear through radiators, pump impellers, heater cores, gaskets, and core plugs. Failure of the cooling system can cause the engine to overheat. Overheating will stretch head bolts and can warp the cylinder head and other engine parts.

Coolant Flush

Follow the manufacturer's recommended coolant change intervals. This may vary between 2 to 5 years, and 30,000 to 100,000 miles. If the coolant becomes contaminated or acidic before the next scheduled change, replace it without waiting, and correct any problems that may have caused any failure. If any major parts are replaced in the cooling system (ie Water Pump, Radiator) new coolant is required to provide fresh additives to protect the new part.

Antifreeze / Antiboil

Antifreeze is always needed, even in warm weather when water won't freeze. The antifreeze also has anti-boil properties that raise the boiling point of the coolant mixture. The internal temperature of the engine reaches temperatures above the boiling point of plain water. The most common mixture rate is 50% antifreeze and 50% water.

Hours of Operation:


Monday - Friday: 9:00 AM - 5:30 PM


Saturday's by Appointment


​Night Drop off available


(541) 754-5310

Greg's Auto Service

440 SW Wake Robin Ave.

Corvallis, Oregon 97333

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From downtown Corvallis:

 1. Drive SOUTH on SW 4th St (US-20)

This a ONE-WAY street heading SOUTH


 2. Take left underpass onto SW 3rd St (OR-99W S) toward Junction City/Eugene (go 1.4 mi) You will travel through two traffic lights. The second is in the Lincoln School speed zone. 20 mph on school days.


 3. Turn right onto SW Wake Robin Ave (go 0.2 mi) This is the first right turn after Park Ave. The shop is on the left before the tracks.