subaru jdm 2 liter conversion from 2.5 changeovers

Nearly every Subaru vehicle with this design flaw will need to make this repair. The cost to repair this failure is approximately $1,500, assuming no internal engine damage. Adding “Genuine Cooling System Conditioner”, as directed by Subaru, simply delays the HG failure and covers-up the fact that the 2.5 L engine is inherently unreliable.ħ. The design flaw results in a latent failure of one/both of the head gaskets.

The design flaw was inherent in the 2.5 L engine at the time it was manufactured. If a failure occurs after 8 years/100,000 miles, Subaru does not take responsibility for head gasket leaks.Ħ. The addition of the “Genuine Cooling System Conditioner” simply delays the failure of the inherent design flaw.ĥ. Essentially, the head gasket failure is the result of an initial design flaw that manifests as a “latent failure”.Ĥ. Without intervention, at least one head gasket in the 2.5 L engine is expected to fail in the life of nearly all 1999 to 2002 vehicles (estimated 90%probability at 100,000 miles).ģ. The coolant leakage problem that occurs in 2.5 L Subaru engines is a result of inadequately/poorly designed head gaskets.Ģ. However, now at approximately 114,000 miles, coolant is profusely leaking through the poorly designed head gaskets.ġ. When I received Service Campaign bulletin in April 2002, I had the dealer add the “Genuine Cooling System Conditioner” to my cooling system. I have a 2000 Subaru Outback Wagon with the 2.5 L SOC engine. stop leak) to the coolant and extending the engine warranty to 8 years or 100,000 miles. The “Service Campaign” for the 1999 to 2002 2.5 L SOC engine consisted of adding “Genuine Cooling System Conditioner” (i.e. It is clear that the inadequate design of the head gaskets resulted in early external coolant leakage failures in numerous vehicles.ĥ. Subaru recognized the HG problem in the 2.5 L SOC engines and in April 2002 implemented a “Service Campaign” to “fix” the problem, which Subaru claims only occurred in 1999 to 2002 model years. In this engine, the failure allows external coolant leakage, which can also result in over heating and engine failure.Ĥ. This engine also had, and may still have, an inadequately designed HG which fails early in the life of the engine. The 1999 to present 2.5 L engine has a Single Overhead Cam. The failure allowed coolant leakage into the cylinders, which often went undetected and resulted in over heating and engine failure.ģ. The 1996 to 1999 2.5 L Dual Overhead Cam engine had an inadequately designed HG which often failed early in the life of the engine. Subaru claims the problem was corrected after 2002, but complaints are still being made on later models.Ģ. The HG leaks occur in 2.5 L engines manufactured since 1996. The HG problems are outlined on the website Summaryġ. The Subaru 4 cylinder 2.5 L “Boxer engine” has had numerous problems with head gasket (HG) coolant leaks.

Subaru jdm 2 liter conversion from 2.5 changeovers