Oil viscosity explained & information relevant to a Subaru Outback.

[@jonkeefer6865]

def for usa mpg ratings. subaru japan still uses 5w30 in their engines. i used 5w30 full synthetic in my 18 legacy 2.5L.

[@HiFiInsider]

my 1995 Civic has 210K miles. The original recommendation in manual is 5W-30 or 10W-30. I am in northern CA which never gets below 40 degrees. Should I go with 10W-30 or move up to 10W-40 due to engine age?

[@SamslamminCars]

If the engine is not burning oil or having any noises, I would stick to 5w-30 or 5w-40. 10w-30 is fine for the summer months but pointless otherwise. SuperTech has a 5w-40 semi-synthetic which is cheap.

[@HiFiInsider]

@@SamslamminCars thank you for the advice.

[@AnhYeuEmMaiMai69]

5W30 synthetic here on my 2010 Outback 3.6R with 191K miles on it. does not drink oil

[@joemikey278]

Why not 0w-30, better lubrication at start up .

[@SamslamminCars]

For very cold ambient temps possibly.. The problem is, the other video I posted shows the loud clatter at startup. It was significantly louder at startup on a warmer day too. Thinner oil at startup for a warm engine with tolerances now worn, has less of a cushion with a thinner weight. This vehicle is in a very warm climate, especially coming up. A lot of variables to take into account.

[@joemikey278]

@@SamslamminCars you’re right about it now, makes sense when you explain it that way. Sorry, I wasn’t attempting to damage the car or anything.

[@SamslamminCars]

@@joemikey278 no apologies needed, a very good question actually!