sedanlegacygt

I have a 98 sedan GT and was using a sythetic blend. I took it to a dealer for a recall and oil change and they said that subaru doesn't "recommend" synthetic oil. 5W30 was the way to go they said, however what brand is kind of up to you.

I do have the DOHC 2.5. But how do you know if it's a phase I? Another question while I'm at it. If I'm going to dump all this money into it, can you swap a 2.5 turbo from an 05 Legacy and if so, does it bolt right in or is it a painstaking process. I'm considering the swap because my 98 only has 83k miles and has had more than it's share of expensive problems, but I love smoking the hondas with the fart bomb mufflers on them.

Could someone please help me. I have a 98 Legacy sedan GT. The main pulley has started to slip off the harmonic balancer, so I replaced it. On the test drive it overheated and that's when the fun began. I pulled off the front engine cover and there was no damage. Put on new thermostat. Radiator is only 3k miles old. New timing blet and tensioner from previous repair. I know about the famous head gaskets, but the car doesn't smoke, no oil in coolant or coolant in oil, and no coolant leaks. The weird thing is the car will run at idle for hours with no problems. It will even drive for a few miles before overheating. I am stumped. Could it still be the head gasket or is there something I missed. Has anyone else had this problem? Please Help me. Thanks.