Quote:
I re-checked my FSM to be sure, but It does say SJ "Energy Conserving" 5W30 for the recommended oil.
I'm not sure about the service manual, but as a past owner of a 2003 WRX, I can tell you for a fact that the 5W-30 recommendation in the owner's manual is qualified "for best fuel economy". The next paragraph goes on to list, as bluesubie says, anything but a 5W-30 if you are going to actually drive the car. 10W-30 through 20W-50 is listed, including straight 30 and 40.
GC is a great choice, which I ran for quite a while. If you want to stick with shorter change intervals, Rotella T5 10W-30 is a great choice. That's what I run in my 2008 LGT. There's no need to go heavier than a 15W40, but you do want to use an oil that has a HTHS viscosity of at least 3.5.
Ed
I re-checked my FSM to be sure, but It does say SJ "Energy Conserving" 5W30 for the recommended oil.
I'm not sure about the service manual, but as a past owner of a 2003 WRX, I can tell you for a fact that the 5W-30 recommendation in the owner's manual is qualified "for best fuel economy". The next paragraph goes on to list, as bluesubie says, anything but a 5W-30 if you are going to actually drive the car. 10W-30 through 20W-50 is listed, including straight 30 and 40.
GC is a great choice, which I ran for quite a while. If you want to stick with shorter change intervals, Rotella T5 10W-30 is a great choice. That's what I run in my 2008 LGT. There's no need to go heavier than a 15W40, but you do want to use an oil that has a HTHS viscosity of at least 3.5.
Ed