2019 Subaru WRX - No 0W-30 ?

[JS2000]

Judging by the replies I will stick to 5w30, and hopefully with a good quality synthetic winter cold start flow wont be an issue. Thanks

 

[Garak]

The main thing I'd worry about (if it were to cause me worry) would be what freedom they give you within 5w-30. Do they allow any SN 5w-30? Or, do they want an SN/GF-5 lubricant? If it's just SN, then a C3 or an E6 5w-30 would work, and my preference would bring me to an E6. If it's SN/GF-5 only, then you have to decide if you want to go outside the manual wording.

 

[bluesubie]

Originally Posted by Garak
The main thing I'd worry about (if it were to cause me worry) would be what freedom they give you within 5w-30. Do they allow any SN 5w-30? Or, do they want an SN/GF-5 lubricant? If it's just SN, then a C3 or an E6 5w-30 would work, and my preference would bring me to an E6. If it's SN/GF-5 only, then you have to decide if you want to go outside the manual wording.

Not sure about the Canadian manual, but the U.S. manual is a little ambiguous.

It states API SN Resource Conserving OR ILSAC GF5. Does such an oil exist? It also states:

NOTE
. Each quantity indicated here is only a guideline. The necessary quantity for replacement may differ slightly depending on the temperature and other factors.

I generally recommend thicker oil in turbocharged Subaru's, but the uoa's on sheared/fuel contaminated DIT's running GF5 5W30's have been showing normal uoa wear despite having the operational viscosity of a 20 grade. I'd also recommend going with a C3 xW30 though.

 

[Garak]

Originally Posted by bluesubie
It states API SN Resource Conserving OR ILSAC GF5. Does such an oil exist?

API SN Resource Conserving is the same thing as ILSAC GF-5, so that part is relatively clear. On the other hand, my G37 manual (and many Infiniti and Nissan manuals) called for SM or newer or SM/GF-4 or newer. The ILSAC/Resource Conserving part was only optional as I read it, and Castrol's oil selector agreed with me, and listed their C3 as an option, but not their A3/B4, since that was SL. I went out of spec anyhow, but that's on me.