Hey all,
Yesterday I did a oil change to my 01 wrx. Drained all the old oil out, changed to a new oil filter. And put in new oil. I put in Penrite 10w-50 as I have done the last few oil changes.

I started her up an left her to idle for about a minute or so and she felt different in general. The exhaust note wasn't the same it was a lot more bellow than normal. It generally idles between 900-1000RPM it was sitting at 600rpm.
Checked for leaks and there's no visible leaks I can see.
I took it for a light drive and it just seemed to lack power and felt like it was struggling through each gear.
When I take off it doesn't sound the same not until I take my foot of the accelerating pedal and I'm just rolling it goes back to it's original exhaust note.

Any help and advice would be greatly appreciated!

I did put about 4.5L of oil in maybe a bit more as well as I put a sandwhich plate on if that makes any difference?

It does have a idling problem with the idle control valve just waiting on a new gasket for it if maybe that could be triggering the exhaust note and lack of power?

Thanks in advance!


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