0w-20

Fram Ultra filter. The short block was swapped out under the Subaru recall at 99K, and has 66K on it. Driving was mostly highway and rural roads, with 2K of towing. 5Q of M1-EP 0w-20, with 2 quarts of M1-AFE 0w-20 as makeup oil. Oil consumption was around 1Q per 6K miles.

I have a huge stock of Castrol EDGE Extended performance oil in the 5w-20 weight. I know the engine calls for 0w-20, but since I have the oil. If it won't harm the engine I would consider using it. The car I will use it on has 100K on it now and was curios. I tend to change oil every 5K and...