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Old 04-24-2015, 09:13 AM   #53
rdieder
Scooby Specialist
 
Member#: 257818
Join Date: Sep 2010
Chapter/Region: SWIC
Location: ABQ, NM
Vehicle:
2007 STi
CGM

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Quote:
Originally Posted by gpshumway View Post

You are correct that it's a heavy duty oil conforming to API SM, but where did you get ACEA E9 and HT/HS of 5.6? The current PDS mentions neither. Are you sure you're not talking about RT5 10w30?. HTHS of 5.6 would be a neat trick for a 40 grade oil, that's higher than Red Line 10w50! I'd be surprised if it's higher than 4.1.

RT5 15w40 will indeed serve your cold start needs fine in SoCal, but RT6 5w40 is only ~$1.25/qt more expensive and drastically better for cold starts, which is why it's mentioned specifically in the guide and 15w40 RT5 is not. Most of North America is colder than SoCal

RT5 10w30 will also serve you well, but it's HT/HS is nowhere near 5.6, more like 3.6.
My mistake. I was looking at the general T5 brochure pdf. The print is small and looked like 15w40 but the table was for 10w30. If RT5 would serve me well, that's good news..it's very cheap at the nearby Tractor Supply.
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