is it a big issue if i overfill the oil on my 2k outback, 2.5L. I change it and bought one of those 5qt containers of gtx 10-30. there is what appears to be 1 qt left, more or less but the dipstick reads a bit above the full mark. I check it on level ground after having it sit for 3 hrs?!! It's says 4.2qts in the manual and there was approx 1qt left, based on the window on the 5qt bottle?~ What do you all think, i can open the pan and drip a bit out but it seems like such a small amt over.....there must be a give or take amount for engines...right, room for "error" or slight over fill in engines... advice y'all PLEASE!!!! Thx