Quote:
Originally Posted by lapsio
So if I were to increase by one step what oil would you recommend? Please consider traces from daily driving shown above if possible.
I'm a bit puzzled because this oil runs quite hot with my driving style, regularly near 120 and guys at Subaru asked me to report when it gets in 120-130 deg range because it may be unhealthy :c According to my observations I'd have to report it like 160 times during service interval or so lol.
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Without a 0w20 baseline, with pressure, and flow data there's no way to determine anything.
I would prefer to see oil temp taken at the sump. It's going to give you more accurate feedback for a couple of reasons. One, is that the temp is skewed because the OEM temp sender is post oil pump. Another reason is that we don't know yet if the ECU is modulating the oil temp displayed. Oddly enough, this is becoming a more common trend from the OEM. We've seen this in Porche, AMG, and even with the 2015 WRX. With the 2015 WRX you'd see a difference swing from 0-to-just over 20 degrees. Why is this done? I speculate that it's done as another layer of safety. Similar to how an OEM coolant gauge is really a course 3-position gauge.
Another thing I would recommend is sending oil samples out for analysis. This is a safeguard against going down a path that is detrimental to the engine. I wouldn't put too much weight into feedback from techs, we hear them give bad info all the time. If anything with a warranty is questionable, Subaru will send a regional tech (non-dealer affiliated) who will make decisions on coverage. He WILL point to the owner's manual if the oil gets tested.