Well spoke to Sti and they use a mineral oil (as we all know) an dthey sell a geniun Subaru one for $29 buck for 5 ltrs.

There ya go

Thanks for all your help - much appreciated

hahaha maddog that site is awsome - thats how i broke in my wrexy - in the country -good work

looking further Penrite do a specific Running In Oil
Castrol have their GTX that is also a mineral based SAE20W-50. My bet would be the Penrite as they say it has less detergents yada yada to assist in the bedding in process...my favourite process

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Speak to Shane @ SMC Tyres, Unit 6/385 Sevenoaks St Beckenham WA 6107. Mobile 0413 128 087. Tell him Maddog sent you!

Yep speed a couple of thousand putting a new engine and all the fruit, to save a couple of dollars putting cheap oil in it..


Wonders never cease

you can't hurt it by using a cheap oil (only during the run in period)...but you risk totally fu<king it if you use an expensive synthetic oil. Your choice.

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Speak to Shane @ SMC Tyres, Unit 6/385 Sevenoaks St Beckenham WA 6107. Mobile 0413 128 087. Tell him Maddog sent you!

so synthetic is a no no and mineral is the way to go....


Thats against what BROCKY said on his ads, mineral oils come out of the ground.


Not being negative I just want to know which one is the better for WRX

How so?

no problems...the initial running in process is critical and requires a certain level of wear to produce good gas sealing of piston rings to cylinder walls. If you use a synthetic engine oil at this early stage it will practically stop the friction from making a near perfect gas seal.

Continue using synthetic for bedding in then there is a high chance of making things a lot worse...you risk glazing the insides of the cylinder wall. If this occurs then you will burn excessive amounts of oil and have a low(er) compression engine, increased oil blow by, reduced power i.e. a dog of an engine.

However once bedded in properly with a mineral based "Running in Oil" then by all means, switch to a synthetic for that added protection

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Speak to Shane @ SMC Tyres, Unit 6/385 Sevenoaks St Beckenham WA 6107. Mobile 0413 128 087. Tell him Maddog sent you!

And don't forget to....

THRASH IT !!!!

for a really good bedding in...

Jamie you should volunteer to run it in for him.