I'm faced with the dilemma of deciding whether an early drain of the FF in our just purchased new Subie would be advisable or not.
We know that some makers have specifically recommended that the FF not be drained early, with Honda coming to mind.
For our '12 Accord, Honda specifically recommended leaving the FF for a full normal interval. The reason appears to have been that the high moly content of the FF was found to be important in providing for proper break-in of the engine and whether that moly came from the oil formualtion, the assembly lube or the moly coating of the piston skirts really doesn't matter.
There are no recent UOAs here of Subaru FF oil except for a couple of 2 liter turbos that have nothing in common with the 2.5 in our new Forester. These UOAs did show very high moly, and it matters not whether that was part of the oil formulation or was effectively an additive from either the assembly lube or the piston skirts or both.
My concern is that I don't want to do an early change now that might bring long term higher oil consumption.
Like the Honda K24, some of these Subarus exhibit very high oil consumption and I'm trying to ensure that nothing I do will increase the likelihood of this.
I do have some very high moly 0W-20 in the form of Idemitsu HGMO API SM, so I could use that for an early drain.
What does everyone think.
I would love to hear from other FB25 owners.
We know that some makers have specifically recommended that the FF not be drained early, with Honda coming to mind.
For our '12 Accord, Honda specifically recommended leaving the FF for a full normal interval. The reason appears to have been that the high moly content of the FF was found to be important in providing for proper break-in of the engine and whether that moly came from the oil formualtion, the assembly lube or the moly coating of the piston skirts really doesn't matter.
There are no recent UOAs here of Subaru FF oil except for a couple of 2 liter turbos that have nothing in common with the 2.5 in our new Forester. These UOAs did show very high moly, and it matters not whether that was part of the oil formulation or was effectively an additive from either the assembly lube or the piston skirts or both.
My concern is that I don't want to do an early change now that might bring long term higher oil consumption.
Like the Honda K24, some of these Subarus exhibit very high oil consumption and I'm trying to ensure that nothing I do will increase the likelihood of this.
I do have some very high moly 0W-20 in the form of Idemitsu HGMO API SM, so I could use that for an early drain.
What does everyone think.
I would love to hear from other FB25 owners.