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    Hi, for a while now, under the front of my car on the ground where I park, there's been a black patch which I've ignored. Since then it's had an mot and service and all is been OK.

    However, I've noticed where I pull in at home, fine tiny 'splat' marks on the ground with a rainbow effect. As a test. I left white sheet under my car over night. Checked this morning and there are two 10p coin size brown marks under the middle front of the car.

    What could this be? Want to avoid taking it to a garage where I could end up paying a fortune.

    Thanks

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    21 Comments

    check the oil, water & brake fluid levels.

    hehe this is great!!!

    Could be as daft as water passing through the system onto the floor?

    If you have no way of knowing exactly from where it is coming you should take it to independent garage. my car recently had similar issue i took it to garage and raised the car on platform. The problem was engine oil sump plug want fully tightened in last service. The garage did not charge me a penny and all was sorted.

    Could well be water dripping off the Air Conditioning Heat Exchanger and taking some muck/ oil with it , mine does that . Try switching the AC off and see if its ok after your next run . If it is this its perfectly normal .
    Edited by: "rogparki" 1st Jan 2015

    You appear to have a very small oil leak. Check the engine oil level. If you can, try and have a good look around the engine bay, and also from underneath the engine. Look for oily residue. Unfortunately, it could be a lot of possible areas like the sump plug, the actual oil filter, anyone of the various gaskets like the sump/rocker cover. Also check that the oil Filler cap doesn't have a mayonnaise like residue....... That'll be the head gasket.

    If the car is a few years old my guess is its either valve cover gasket, oil filter housing gasket or oil vacuum pump gasket. All simple fixes for a garage.

    Original Poster Banned

    Thanks everyone, will stop using the air con and see if that's all it is. I have it on all the time so it could be.

    Just trace it back to the highest point.

    My guess is crankshaft pulley oil seal. Then the drive belt is flinging it about causing the 'splats'.

    Edited by: "will3000" 2nd Jan 2015

    jaydog69

    Thanks everyone, will stop using the air con and see if that's all it is. … Thanks everyone, will stop using the air con and see if that's all it is. I have it on all the time so it could be.



    Unlikely to be Air Con with " rainbow effect drops ", that indicates oil.

    aircon deposits wouldnt be oily...but theres any number of places it could be coming from....its impossible to say without having a proper look....you need to take it to a local garage (preferably recommended) and get it sorted hopefully cheaply before it becones a bigger problem.

    Inactive

    Unlikely to be Air Con with " rainbow effect drops ", that indicates oil.


    What condenses on the heat exchanger ? err water what is on the bottom of every engine ? err oil . What makes rainbow drops err water and oil . Nuff said

    PLANKT0N0

    aircon deposits wouldnt be oily...but theres any number of places it … aircon deposits wouldnt be oily...but theres any number of places it could be coming from....its impossible to say without having a proper look....you need to take it to a local garage (preferably recommended) and get it sorted hopefully cheaply before it becones a bigger problem.


    Show me an engine that hasnt got a bit of oil on the outside , add water that condenses on and drips from the outside of the Air Con Heatexchanger (its cold, same principle as the freezer plate in your fridge or freezer ) and what have you got ? Water +Oil +Muck = dirty rainbow effect drops .
    Edited by: "rogparki" 1st Jan 2015

    rogparki

    What condenses on the heat exchanger ? err water what is on the bottom … What condenses on the heat exchanger ? err water what is on the bottom of every engine ? err oil . What makes rainbow drops err water and oil . Nuff said



    No oil on the bottom of my Honda, nor any other external surface.

    The OP needs to get the car inspected properly, nobody on this forum can diagnose a fault that none of us can see.

    It is pure guess work.

    One other thought - They are deffinatly "black" in appearance, i.e could it be a fuel leak?
    My 1st car developed a fuel leak and it had the "rainbow effect" where it was parked.

    but yes if your not a car mechanicly minded i would take it to a car mechanic to investigate further. They should advise for free and give a repair cost.

    Inactive

    No oil on the bottom of my Honda, nor any other external surface.The OP … No oil on the bottom of my Honda, nor any other external surface.The OP needs to get the car inspected properly, nobody on this forum can diagnose a fault that none of us can see.It is pure guess work.


    Agreed, but if as I suspect it stops when AC turned off it will show there is no fault . My last 3 cars have all done it after a run when AC turned on , yours will do too.

    Where is the Oil Filter? As could just be a leaky seal....and if it's a small leak there should be a trail from the source just get on your back and have a good look with a torch....

    Make, model, fuel type would help

    Inactive

    No oil on the bottom of my Honda, nor any other external surface.The OP … No oil on the bottom of my Honda, nor any other external surface.The OP needs to get the car inspected properly, nobody on this forum can diagnose a fault that none of us can see.It is pure guess work.


    No oil anywhere on my passat engine either, but even though both of us have said this, rog will still insist he's right.

    craigstephens

    No oil anywhere on my passat engine either, but even though both of us … No oil anywhere on my passat engine either, but even though both of us have said this, rog will still insist he's right.




    Indeed, I have a name for the " Rog " types of this world, but I am far too polite to mention it ..

    oil pressure sensor a good favourite for leaking on threads
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