d7nmr

Done a oil change on previous cars before. Will it be the same procedure for sti classic.

Keep hearing these things about crank sensor and others are saying I didn't do that. So what the correct way of doing the oil change.

Same procedure as a Clio or a Honda. Saying these because done a oil change on them before and it's nice and simple steps.

What do i need to look out for?

my94wrx

iTrader: (4)

its up to you how you do it, the only thing i do is fill the filter before fitting, fill the engine and start in the six years i have had my subaru i have never disconnected the crank sensor for a oil change and never will, although as i have said its up to you.

d7nmr

I'm doing a oil change on Saturday, really confused about this

my94wrx

iTrader: (4)

confused about what?

mystery_machine

iTrader: (1)

I agree with my94wrx, same as any car really but I would fill the filter with oil before you put it on the car

bish667

iTrader: (1)

+!

kaz_r555

the only reason you would disconnect the crank sensor is so you can perform a method called dry cranking. doing this after topping up the oil filter and fitting, will circulate the right amount of oil through the engine as a Safety Measure. also you can remove spark plugs rather than disconnect crank sensor as it will take the same effect.

musso2010

For some reason, people think it is a 'dark art' doing an oil change on the impreza... but the guys above have got it right. Pre-fill the filter, and dry crank it. Simples.

Gambit

iTrader: (6)

there is no need to even dry crank it. you dont dry crank your car every morning do you? so why would you dry crank it after a 20min oil change. unless its a fresh engine rebuild or has been lying for about 6mths i wouldnt bother dry cranking.

pre fill the oil filter thats all.

kaz_r555

well when your doing an oil change the oil is drained out, overnight your oil is still sits in the engine. so dry cranking is not needed.. just a good way get oil around the pistons before you start the car.

andyamf

when you leave your car overnight mate the oil sits in the sump, it drains there overnight.
when you change the oil you take it out of the sump and put it back in the sump, no difference.
fill the oil filter with oil and start it up.

TonyBurns

iTrader: (3)

Well it would be the first time ive ever heard a subaru sump taking 4,5ltrs of oil
It doesnt all drain to the sump, when you do an oil change it all drains out of the engine, which means you have no oil in the journals, at night only so much drains back to the sump (probably 2-3ltrs depending on which model you have), the rest is still in the oil journals and will provide lubrication when you start your engine.
On doing an oil change you have no oil in the journals as its not been run through the engine, hence why you dry crank it to stop you getting oil starvation.
Lots of threads on this, worth using the search button

Tony

Gambit

iTrader: (6)

what happens then when you refill with the new oil and the 2-3ltrs goes into the sump, where does the other 1.5-2.5ltrs go?