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I have been running the Castrol Edge 0W40 for a few years. I regularly send in samples to Blackstone for analysis. I noticed a significant change in the additive package around my 6/2017 and 11/2017 reports. Boron has increased from around 1-2 up to around 30-50. Calcium has increased from...

I have a 02'Subaru outback 2.5 EJ25 with a recently installed new short block. Wondering which particular full synthetic Castrol, M1 or Rotella T6 would be best for that engine?

I have a 2002 Subaru Outback Automatic Wagon with the 2.5 EJ25 engine. It has 212,000 on the odometer. The heads were rebuilt 60,000 miles ago. A new Subaru short block was recently installed. I have about 2,000 miles on the new short block. I initially ran Brad Penn 30WT break in oil for the...

Does anyone know anything about these oil filters for Subaru? The non-turbo blue one is a Six Star branded filter. It is supposed to be the same size as the original now discontinued larger filter from Subaru. I cannot see from the picture what brand the turbo filter is...

I have a 2002 Outback with the 2.5 SOC. A new short block was recently installed. the oil pump that was installed is from the 08'+ STI which has an 11mm rotor. The flow rate and oil pressures are now higher than with the original 7mm oil pump rotor. Do I need to consider using a different oil...