H2o-uk

iTrader: (1)

Hi all,

Ive done numerous searches on here regarding my question, and everyone has there own opinion etc but I'm looking for some help. I have an 03 WRX that has been serviced by Subaru using there standard fluid changes etc every 10k miles. I have recently had my car serviced at 40k miles then remapped to around 270ish and its coming upto to 45k Miles. I was going to change the oil as it seems the done thing with modified subarus but which oil to go for. It has been using Mobil 1 ESP 5w30 the last two services, and I was wondering whether to stick with this or move to a 5w40 or 10w40 ? I was going to speak with Oilman regarding manufacturer of oil to get his opinion also.

Thanks

s70rjw

iTrader: (2)

10/40 fully synthetic will give your mildly modified car better protection when hot compared to a 5/30. Personally I use 10/60 as recommended by all 3 experts who have fettled my car. Its largely down to personal choice and there is no definitive answer. Merry Christmas

gallois

i would recommend a 5w40 ester based oil for winter (10w40 ester in summer). Subaru want 10cst at their bearings, a SAE40 oil flows at 14sct at 100deg (an sae60 oil flows at 24cst at 100deg!)

H2o-uk

iTrader: (1)

Thanks for the responses folks, I'll probably look at some fully synth 5w40 in the new year and when its due a service replace it with some 10w40. I've heard Millers is pretty good, does anybody have any other suggestions ?

Merry Christmas, thanks for the help.

TonyBurns

iTrader: (3)

You can run the 5w40 all year round, not really an issue in our climate

Tony

dazmotaz

millers cfs 10w 40 every time

JonMc

iTrader: (51)

I've just got hold of some millers for mine from Import Car Parts, there isn't really any other 10w-40 fully synth out there; Fuchs Titan is a good alternative if you go for 5w-40.