SubeeTed Posted August 12, 2004 Share Posted August 12, 2004 Hi all! I'm going to change my Dino Oil in my newly acquired '97 Legacy Gt, with it's 2.5 ltr. This is a dealer maintained car. It's always had Castrol GTX 5W-30. It's had it's lower-end replaced about 40K miles ago, by the last owner, the dealer did this work. I'm looking for better fuel milage. So what have people used out there in real life and had succes with? Castol Synthetic, Mobil 1, or that Amsoil that can stay in forever it seems? I do intend to drop in a K & N air filter as well! Many thanks, SubeeTed Quote Link to comment Share on other sites More sharing options...
99obw Posted August 12, 2004 Share Posted August 12, 2004 I prefer Group IV, polyalphaolephin. Mobil 1 or Amsoil. Castrol Syntec is usually a group III, though I think the 0w-30 may be a group IV. My favorite oils right now are Mobil 1 Truck and SUV 5w-40 and Amsoil AFL 5w-40. I think the Mobil 1 5w-30 and 10w-30 are too thin for an engine with some miles on it. Amsoil 5w-30 ASL and 10w-30 ATM are great oils. Don't expect better fuel economy from a synthetic unless you make mostly short trips. You may see better economy, but it's not a certainty. Don't get me started on K&N air filters. Quote Link to comment Share on other sites More sharing options...
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