
I asked my service advisor and have it in writing that I'm okay to use a 5w30 of my choosing even if it doesn't meet the exact API SN-RC GF-5 spec in the owners' manual.

I've also read dozens of UOAs and a recurring trend seems to be that EJs are not very happy with thinner oils. I'm siding with Subaru engineers who put an oil cooler in there and just use the best SN-RC GF-5 oil I can find, not a high HTHS oil for no apparent reason. I don't think using Motul or Rotella T6, as you're planning, will do anything to damage your engine. MOTUL 8100 X-CLEAN EFE 5W-30 has synthetic base stocks coupled with specific friction modifier molecules and dedicated SAPS levels that generate outstanding.

MOTUL XCLEAN 5W30 MANUAL
Some say they don't care as long as the oil "looks OK on the dipstick", and some say they will demand the correct Owner's Manual spec be used exactly. Buy in monthly payments with Affirm on orders over 50. Es un lubricante cien por ciento sintético que le da potencia, velocidad y lubricación al motor, lo que reduce la fricción interna del mismo y minimiza las pérdidas de su potencia. Whether Subaru will enforce that is up in the air, since I've heard stories that go both ways. Advanced 100 Synthetic lubricant that provides at the same time High Protection and Fuel Economy. Un aceite 10w40 que marcha de forma adecuada para los motores de coches tanto de cuatro ruedas como de dos e incluso de tres. Compatible with catalytic converters and Diesel Particulate Filters (DPF).

EURO 4, EURO 5 and EURO 6 emission regulation compliant. According to the Owner's Manual, which apparently nobody reads, you need a 5w-30 full-synthetic that is SN-RC and/or GF-5. 100 Synthetic High Performance Gasoline and Diesel engine oil for latest generation cars, requiring high HTHS and mid SAPS oils. Except all the oils you choose don't meet warranty requirements. I'm using a 5w30 in an attempt to keep Subaru happy under warranty.
