hi guys i have an 09 impreza 2.5i and i do mostly city/traffic driving with 10mile long trips each time. the weather is cooling off now and since i do 3750mi OCI i will do a bit of Canadian November driving on this oil. i dont generally warm up the car (idle) for more than 15 seconds for fuel economy reasons. my car runs pig rich when cold so i just drive under 2000rpm for a few minutes until coolant temp is hot. walmart currently has Valvoline synpower on sale for $20 a jug and i can get the Pennzoil conventional yellow bottle for $25 a jug. i like the Pennzoil more on paper because it seems to be packed with additives (8.3 tbn, 2400 Ca, 868 Zi, 269 moly). The synpower however is synthetic with lower pour point (-42c vs -39) and also cheaper. which is better for me?
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