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I'd recommend waithing until about 10,000 miles, but there is no real harm in changing it now. Please do a search on either "oil" or "Mobil" and you'll find a ton of threads with questions such as these ;)
 

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Tokyo's between my toes
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Since my engine recently got an overhaul, I may try synth or a synth blend while the weather is cold.

I know synth made a huge difference with the Escort when the weather turned really cold - basically acted like a warmed-up engine even when you'd know a cup of water poured on it would freeze to the metal.
 

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No problem at all at that mileage. I switched to M1 @ 2,500. It is better to leave dino in for a thousand or so to let the rubber seals set right, synthetic will not do that. (or at least it takes a lot longer) Brian
 

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it's not just the seals. my understanding is that synth oil is so slippery that it actually delays/interferes with the normal initial wear-in process whereby the piston rings and cyl walls, for example, get accustomed to each other's face by scraping together until the scrapes (microscopic, of course) match.

in theory, if you switch to synth well before the car is broken in to where it's getting full gas mileage, it might delay that point a bit, but this is likely offset by the reduced cold viscosity etc of the synth.

how good is the stuff? with an air cooled 4 cyl bike engine, you can actually HEAR the difference...engine quiets down noticeably when you go from mineral oil to synth. :)
 

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Yes, break in period is extended. But that's about all I have heard. You can talk to ten people and get nine different answers. But for the most part, I think anytime after the initial 1200 mile break in period that Subaru states (mine was, anyway)

Brian
 

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Changed mine to Mobil1 before 1500 miles. I had planned on it all along even with the concerns about break-in period. Figured I could risk finding out if it does well or not. Guess I'll know in few years if nothing happens having to do with engine oil directly.

It's doing 27 mpg consistently at 7600 miles so I'm still hoping for better. Was more like 24 to begin with, then 25...
I don't go too easy on the accelerator from a stop but I use cruise control a whole lot.

Of course, when it comes to gas mileage the tire inflation has plenty to do with that too. I keep watch on my tires. Just did the first "rotation"-- or swap-- front to back.

If you haven't seen it yet, this place has been doing a real life (close as it gets maybe) comparison of Mobil1 and AMSoil.
http://neptune.spacebears.com/cars/stories/oil-life.html
They're about to begin a second run of Mobil1. Been interesting to watch.
 
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