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How Much Oil For Rb25 With Hks Oil Cooler

Kaido_RR

By Kaido_RR,
in Engines & Forced Induction

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PM-R33 Grand Master

PM-R33

Posted
Posted
Hi

Just wondering if i need to add some more oil since im running a HKS R Type oil cooler. I know std rb25 is 5.5L with filter but i am now running a s15 filter (its smaller) and the extra lines for the cooler

thanks

5.5L :P Pretty sure it is like 4.5L - 5.0L depending how you drain it (warm, cold, vacuum drain, gravity drain etc).

Shaun O Enthusiast

Shaun O

Posted
Posted

I just fill my cooler up seperately, since I take it off to drain it for an oil change (highly suggest this too, it's really not that hard if it's in an easy to get to place). Then put the usual 4.5 litres or so then run the car, let it cool down and then check the dipstick.

  • 1 year later...
rad100 Grand Master

rad100

Posted
Posted

sorry to dig up a new thread, im flushing my engine oil. wondering how much to re-fill

the oil in there has only done 30 dyno runs as it was used to just flush and clean the engine.

i found the norm is 4.5l for the engine, say 500ml for cooler +some for lines.

now im taking it to the track monday. so i was told to overfill.

how much would i put in? 5.5L? 6L?

stock sump btw

75coupe Grand Master

75coupe

Posted
Posted (edited)

my 25 with hks type s cooler takes 6L abouts, I know its more than a single 5L oil container

oh yeah thats mounted in passenger side as well...

Edited by 75coupe
JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

fill it to the hump on the dipstick, start it and let it run for a bit, then check the level again

no one can give you an amount in litres as it varies, mostly on how much oil was drained, ie is the cooler completely empty?

  • 3 weeks later...
NISMOGTT Collaborator

NISMOGTT

Posted
Posted

Hi guys,

everyone is saying to put in extra oil then start the car and let it run, do i assume let it run all the way to operating temp as the HKS oil cooler has a thermostat built in meaning it will not fill the cooler until the thermostat opens.... this would mean your overfull until this opens correct?

Also wondering how the oil would drain from the cooler knowing that it is lower than the lines running to the oil filter and by means of gravity the oil would remain in the cooler?

sorry if these are noob questions my logic could be way off, i am looking at putting a cooler on very soon and have never had one to know the answers.

Dave.TAS Community Regular

Dave.TAS

Posted
Posted

It doesn't unless you remove the oil cooler and pour it out.

Also most oil thermostats don't completely block of The oil cooler so it should start to fill as soon as you crank the engine.

When fitting new oil cooler kits I always disconnect the ignitor and fuel pump fuse and crank the engine for a while to pre fill the lines and cooler so the engine sees oil sooner rather than later when u fire it up properly

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