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Black Oil Straight After Service?

andymoocow

By andymoocow,
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andymoocow Grand Master

andymoocow

Posted
Posted

Alrighty, I have a fairly modified R33 with HKS GT-RS turbo, all supporting mods, making around 255rwkw. Only had it a few months, bought with all the supporting mods. Engine has been rebuilt with forged pistons, race bearings, reconditioned head, new timing belt, etc. As soon as i got the car, had it serviced, oil went black pretty much straight away. Just had it serviced yesterday, and oil went black after a short drive to the shops and home. The oil is not super sludgy or have chunks of stuff in it or anything just goes really dark, then a little bit darker over time.

Car runs fine, current tune is a bit rich, apart from that all seems good.

Anyone know why on earth the oil goes black literally instantly? Mechanic said something like "exhaust leak that could be contaminating the oil??????" I am not sure if thats what he said, as i am VERY far from a mechanic so might have heard him wrong.

Oil used is Mobil 1, pretty expensive, but happy to pay for good oil.

Its my second modified GTST, my first one, the oil always stayed super clear until next service.

Oil pressure always fine, car has a Trust Oil Cooler if that matters.

I am not a technical person when it comes to engines, so apologies if i have excluded several bits of crucial information.

Cheers!!!!!!!!!!!!!!

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blind_elk Grand Master

blind_elk

Posted
Posted

I believe it's a good thing for the oil to go black. That means that the oil is doing its "detergent" function, cleaning up the insides of the engine.

I would recommend you contact the Mobil Oil Technical line (find details at mobil.com.au).

GTR-N1 Grand Master

GTR-N1

Posted
Posted
Anyone know why on earth the oil goes black literally instantly?

He didn't put the old oil back in did he?

sorry- had to ask hehe

My ELF oil goes pretty black within 500-1000Km - not that quickly tho'

andymoocow Grand Master

andymoocow

Posted
  • Author
Posted
He didn't put the old oil back in did he?

sorry- had to ask hehe

My ELF oil goes pretty black within 500-1000Km - not that quickly tho'

Gday Terry, yeah that the exact same thing i asked him!!!!! He laughed at me when i asked too.

Yeah i would assume it would slowly go black over time, but instantly seems like a bit of a problem to me, but i dont know anything about the subect so need the pro's (the super experienced skyliners on here) to help me.....

Thanks for the post blink_elk, so as the oil is doing its detergent function, does that mean after a few more oil flushes the engine will be clean on the inside, or once its dirty it stays dirty??? Yep silly question, but i honestly have no idea! Cheers.

mad082 Grand Master

mad082

Posted
Posted

if the oil is going black straight away then it means that there is still a large amount of old oil still in the system, and i would be willing to be that the oil cooler is to blame. depending on how the piping is run to it, there is a good chance that when the oil is being dropped a lot of oil is staying in the cooler and not draining out. this means that when you then run the car the new golden oil is mixing with this black oil and turning your new oil black.

no amount of 'detergenting' of the oil should be turning the oil black in such a short period of time.

andymoocow Grand Master

andymoocow

Posted
  • Author
Posted
if the oil is going black straight away then it means that there is still a large amount of old oil still in the system, and i would be willing to be that the oil cooler is to blame. depending on how the piping is run to it, there is a good chance that when the oil is being dropped a lot of oil is staying in the cooler and not draining out. this means that when you then run the car the new golden oil is mixing with this black oil and turning your new oil black.

no amount of 'detergenting' of the oil should be turning the oil black in such a short period of time.

tops, thanks for the post. Oil cooler is located in drivers side brake vent, below the foglights (on S2 GTST) if that makes sense, see pic:

post-43247-1264131397_thumb.png

how do you get all the old oil out then? Thanks again for the post, greatly appreciated.

andymoocow Grand Master

andymoocow

Posted
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i'm honestly not sure, but removing a line would be one way if the cooler doesn't have a bung.

Good stuff, will give it a whirl then, thank matey.

Or a question to anyone with an oil cooler that knows HOW to remove the nasty oil form the oil cooler........ help please :domokun:

Thanks for the posts people, keep them coming, as i need all the help/advice/tips i can get, cheers!

mad082 Grand Master

mad082

Posted
Posted

it would really come to how the piping is run as to whether the oil drains out when you drop the oil or not. if the cooler is mounted lower than any point in the return line then oil will stay in the cooler. the other way to get the oil out if there is no bung or without pulling a hose off would be to unscrew the cooler and simply lift it in the air and all the oil will run out, but pulling a hose off would probably be easier, just a little bit more messy

NZM.031 Grand Master

NZM.031

Posted
Posted

the problem with that though is playing with the hoses each service, will overtime cause new problems to arrise.. worn threads, loose fittings, rounding fittings etc.

maybe later down the track, get a hose dude, enzed, link, etc... to put a drain tap in one of the hoses, that way your not touching the fittings all the time and if it starts to leak, it can be removed or replaced in minutes without requiring a new hose to be made, a new oil cooler or a new adaptor.

NISMO Grand Master

NISMO

Posted
Posted
Good stuff, will give it a whirl then, thank matey.

Or a question to anyone with an oil cooler that knows HOW to remove the nasty oil form the oil cooler........ help please :P

Thanks for the posts people, keep them coming, as i need all the help/advice/tips i can get, cheers!

Yep will need access to the lines dude.

My cooler is flat under the car, which is not good for hitting ripple strips, but awesome for oil changes. So, simply unscrew the lines and it all comes out. I do it every third change or so.

But in your case, you would have to take off the front bar.

The other option might be to unscrew the lines where they mount to the block on the sandwhich plate. That should pretty much be your lowest point so gravity will do the work. Not sure in a 33, but in the 32GTR its an absolute b!tch to get your hand in there.

andymoocow Grand Master

andymoocow

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Bobby, how are ya tiger?

Thanks for the post mate, will look into whats the best way to do it on my car, either way i think it will be annoying. Bugger. Stupid skylines, i love them, but love to hate them too...... :P

andymoocow Grand Master

andymoocow

Posted
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Anyone with an R33 with the oil cooler in the same place as mine (or anyone know of someone else with oil cooler in same spot) know the best way to drain out the oil from the oil lines?

CHEERS in advance :P

Andrew

The Bogan Grand Master

The Bogan

Posted
Posted

I dont bother with the oil in the cooler, but it doesnt go black, it only ends up slightly darker then new oil, I think the cooler holds around 1.5ltrs and when I drain the sump I put in around 5 or 6 litres depending on if its before a track day or not, so its getting 80ish% of fresh oil and a new filter on a change.

My oil does smell like hydrocarbons when its getting dark and ready for a change but Im told that higher boost does this.

Peace Love and Mungbeans.

On a lighter note I put the car in for a tune and have to replace my wastegate and exhaust manifold as they are both fubar

Duncan Grand Master

Duncan

Posted
Posted
Anyone with an R33 with the oil cooler in the same place as mine (or anyone know of someone else with oil cooler in same spot) know the best way to drain out the oil from the oil lines?

CHEERS in advance :O

Andrew

the lines into the oil cooler point upwards do they? best idea would be to mount it so the lines hang down like I did but its a bit late now.

if the lines exit upwards you only have 2 options to empty the cooler:

1/ undo the lines and turn the car up side down until the oil stops coming out of the cooler

2/ take the oil cooler off the car and just turn it upside down.

2 is more convenient normally

08yannch Rising Star

08yannch

Posted
Posted

i dont know just spit balling

if u have a remote oil filter could u take it off and run compressed air through the lines to push the oil through the oil cooler and in to the block.

other wise have the oil cooler mounted so that the fittings point down and fit a T piece with another oil line 4 oil changes

or ur mechanic is ripping u off by putting super cheap mineral oil in. if all else fails run a flush through the system

andymoocow Grand Master

andymoocow

Posted
  • Author
Posted
the lines into the oil cooler point upwards do they? best idea would be to mount it so the lines hang down like I did but its a bit late now.

if the lines exit upwards you only have 2 options to empty the cooler:

1/ undo the lines and turn the car up side down until the oil stops coming out of the cooler

2/ take the oil cooler off the car and just turn it upside down.

2 is more convenient normally

tried option 1, got all the oil out, but pulled my back putting the car upright again........ :rant: NOT!!!!!!!

Option 2 it is!!!!!!!

Thanks Duncan.

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