I just had the oil changed at the dealer* on our Impreza RS2.5 - I had
specified synthetic but they called and said that Subaru doesn't
recommend it for this engine. I think your car has the SOHC 2.5,
right? So, if it were me, while the car is under warranty, I'd use
what is recommended by Subaru.
*No, I don't normally do this but I took it to them to have them fix a
P0446 code that we couldn't resolve.
Dan D
'99 Impreza RS2.5 (son's)
Central NJ USA
I think I'd check with Subaru. I was just reading about the Chrysler
Hemi and their 4-6-8 multi displacement motor and you Must use 5W-20
in for it to work right. It said to Watch it being put in, and dealers
will buy 10W-30 or 40, partly out of Ignorance, or because it is
Cheaper. Maybe they feel the same profit with synthetic, the price
would look excessive.
I have a 07' 2.5i SOHC. Sube says synthetic is fine for it. I bought
some Quaker State "Q" synthetic on sale, and will probably use it when
I change it. I feel synthetics are good for much longer than Sube says
to change it, but being under warranty, I'll change when they say. not
that I want Any mechanic working on my cars, since I often have to
ReDo what they did, or had to sove a problem for pennies, after they
made it a major job to bilk the mfg, but in case I decide to let them
try. I might put what drain out into my 86' Chevy that has 75K on it,
and see how that goes. The Sube will be getting mostly highway miles
on it, and maybe not that many.
I was reading that Sube recomends 5W-30, and said gas mileage is
better. If my brain isn't too damaged, I Think multi vis oils go to
the higher vis at operating temps, and the difference between 5 & 10W
when cold doesn't seem that much. I debated and bought 10W-30. Now
would 5W protect the motor better than 10W when cold, flowing faster
and better, and save that much gas? That's right, I plan to let the
temp gauge start moving before redlineing, and melt some glaciers, so
probably doesn't matter. That 5W will be up to 20W by then.))
I usually pour some keroscene in after draining oil, to flush out as
much dirt as I can with Dino oil. I guess a little kero won't bother
synthetic, but I'd feel better if they made synthetic keroscene.))
VF
