ossett2k2

iTrader: (9)

Hi I always use millers oil,this is my 3rd Impreza but my 1st type ra and have always used 10w40. I have recently notice people on the forums saying they use 10w50. Would this be the preferred oil for my ra?
Cheers Rich

mtb_ed

iTrader: (4)

RCM recommend 15w50 or 10w60.

I use 10w60

mnem1c

iTrader: (4)

Depends on how you drive the car.... Road, track?

ossett2k2

iTrader: (9)

Doing more reading and looks like there are few different opinions on this and most answers are right or at least not wrong,different strokes for different folks
I guess there are a few correct options.
It's my daily driver so mostly road use,I will probably have a few track days further down the line.

oilman

iTrader: (9)

It really comes down to how modified the car is. The more modifications to the engine, the hotter it runs, leading to the oil becoming thinner. A few minor mods will mean there is no need to use a thicker oil than standard. A heavily modified car might need a grade or two thicker.

Cheers

Tim

wms-racing

It also depends on the build spec of the engine, a full race engine with 'slacker' bearings needs thicker grade oil.

ossett2k2

iTrader: (9)

Some good answers there making it a lot clearer for me to understand. Cheers guys