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Old 02-08-2005, 11:57 AM   #4
Scooby Newbie
Member#: 6436
Join Date: May 2001
Location: Holland, PA
1998 Impreza 2.5RS

Impreza GC8 yes

Yes, given reports of increased oil consumption from others, I would recommend using something slightly more robust than low-HTHS 5W-30. If you'd like to stay with recommended viscosity for warranty retention, try using a 5W-30 oil with HTHS above 3.5. BMW 5W-30 comes to mind -- inexpensive and readily available at your friendly local BMW dealer.

An API-rated "high mileage" oil would do nicely, too. But look for one that has the right viscosity. For example, Valvoline MaxLife is NOT the one to use. Castrol GTX HM 5W-30 and Pennzoil HM 5W-30 both have slightly higher HTHS viscosity. Look for 5W-30 oil that does NOT indicate "Energy Conserving" on its label.

If warranty is not a concern, I would use German Castrol Syntec 0W-30, if you can find it. Or a more commonly available 10W-40 oil, such as new Mobil 1 EP 10W-40, Castrol Syntec 10W-40 or Valvoline Durablend 10W-40. For low-temperature environments use 5W-40, such as Valvoline SynPower 5W-40 available at PepBoys.
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