You should be aware that there are actually 2 head gasket problems. The early 2.5 (DOHC) commonly gets an internal leak, combustion-to-cooling. The later 2.5 (SOHC) has issues with external leaks- coolant escape, oil escape.
The external leak is a lot easier to deal with, because you can keep adding coolant and oil as it slowly leaks out until you get sick of it. The internal leak has you overheating & broken down on the side of the road. They are almost identical in terms of what is involved in fixing them though. I think the changeover was in 2000 but you'll want to confirm this.
The H6 engine from 2001-onwards is not known for any type of head gasket trouble. I'm sure there are exceptions but they have a bulletproof reputation overall. Slightly less MPG & only offered with auto trans are the trade-offs of the H6.
Good luck!
The external leak is a lot easier to deal with, because you can keep adding coolant and oil as it slowly leaks out until you get sick of it. The internal leak has you overheating & broken down on the side of the road. They are almost identical in terms of what is involved in fixing them though. I think the changeover was in 2000 but you'll want to confirm this.
The H6 engine from 2001-onwards is not known for any type of head gasket trouble. I'm sure there are exceptions but they have a bulletproof reputation overall. Slightly less MPG & only offered with auto trans are the trade-offs of the H6.
Good luck!