myself and im sure other wrx's owners use penrite SIN 10

see if you can return that oil and only buy fully synthetic, either 10w or 15w

all oils come from the big refineries the smaller oil companies just add there differant additives and viscosity agents ... just choose a good name brand with correct viscosity and stick with it ... most oils these days are fine to use just dont mix them and things will be fine ... but have you tried amcap for a price on subaru oil ... just use a company name and they should give you trade price ...

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Too much power is just enough ....

<<Big long deep breath>>
of course someone who works for a dealer can get it cheaper than you, it a perk of workin for a dealer, just run castrol edge it's t same oil, irun mobil1 because it rox, subaru dealers cant do trade prices, only subaru parts wa can, theyre in d amcap building hence why you hafta go t amcap t get trade pricing

It seems like you can't afford a new keyboard either (or one that doesn't have missing letters)

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

thanks guys from wat ive recovered 10w is wat i think im going 2 get. any idea wat "premium" synthetic is?

Its just castrol edge full synthetic

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just some colourful marketing language.

ic cheers for that but i wonder if edge is reasonable price, the oil i use atm seems 2 b great smoothe etc and good economy arnd 500km + a tank so i do see the point of switching, unless like sum peeps said i should b running 10w not 5w...

thanks again for all the replies

Based on what?

I use 5w50 mobil1 in a 230,000km old ej207, it has >40psi of oil pressure @ idle on a hot engine and >90 psi above 2000rpm to redline.

These aren't american engines.

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

lol

You know what they say boss; Oils is oils...

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MY99 WRX sedan WRC blue Sold :(
MY99 WRX sedan Dark blue pearl :D
MY97 Liberty Outback Ltd Wagon
1990 Mk3 Supra turbo fully rebuilt 7M-GTE (Older son)
1991 Celica GT4 (Younger son)