I am rebuilding the EJ25 in my mom's '99 Legacy GT because she had an oil leak and ran it low and ended up with a rod knock. The engine is DOHC and Phase II (I have found much documentation saying that this is not a Phase II, but it has 52mm rod journals and the crank thrust bearing on the #5 journal).
At 125,000 miles she has NEVER had a head gasket problem, but I understand that they are the weak point of this engine. What are the best head gaskets for longevity? The engine is nothing special, and driven normally, however I would like to buy the best thing available. I've noticed that there are gaskets available from Cosworth, and Cometic (two companies I have had much luck with in other applications). Are either of those good options? Is the updated OEM headgasket a better choice?