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White Gunk on oil filler cap


Hellreign

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Hi all, hope your all well.

Had a bit of a scare the other day when giving my car a quick check over. Took off the oil filler cap to discover a small ammount of white gunk/mayo on the underside of the cap (i check levels once every 2 weeks)

I haven't lost any oil, and the rad is still brimmed, so i'm guessing its due to the cold and many short trips (1mile at a time most of the time....i'm lazy i know :lol: )

I'm going to get her serviced (3k service - fluids filters etc) soon, but is there anything else i need to look at to make sure its not the rocket/head gasket?

She doesn't smoke heavily (obviously in the cold its fairly heavy condensation) and it hasn't built up since i wiped it away

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Hi all, hope your all well.

Had a bit of a scare the other day when giving my car a quick check over. Took off the oil filler cap to discover a small ammount of white gunk/mayo on the underside of the cap (i check levels once every 2 weeks)

I haven't lost any oil, and the rad is still brimmed, so i'm guessing its due to the cold and many short trips (1mile at a time most of the time....i'm lazy i know :lol: )

I'm going to get her serviced (3k service - fluids filters etc) soon, but is there anything else i need to look at to make sure its not the rocket/head gasket?

She doesn't smoke heavily (obviously in the cold its fairly heavy condensation) and it hasn't built up since i wiped it away

Hi - most probably condensation. You would be losing water losing water if it was the HG and as you say it would seem smokey(steamy). Is it running fine?

Gareth

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yeah i'm leaning to condensation also. Did a run to southampton and back yesterday (quite calmly just in case) so i'll have a look under in a bit to see if anything happened.

She seems to be driving normally. might get a compression test done when the service happens

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cheers for the responses guys, just had a quick rumage. All clear after the 80 mile round trip so i guess shes good.

might get the thermo stat changed though, she warms up ok, but driving along the motorway brings the needle back down to cold. and then it rises again in town. or is this fine also? (she does idle high on cold starts more so in winter, but under 2k)

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cheers for the responses guys, just had a quick rumage. All clear after the 80 mile round trip so i guess shes good.

might get the thermo stat changed though, she warms up ok, but driving along the motorway brings the needle back down to cold. and then it rises again in town. or is this fine also? (she does idle high on cold starts more so in winter, but under 2k)

You would normally get a cooler reading on a motrway because of the cooling effect of the fast air flowing through the radiator. How cold is it reading?

Sounds like you have got some car worries in your head and cant get them out! Happens sometimes!

Gareth

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yeah obviously its bound to get cold doing open continued cruising in this weather, but it drops all the way down. Its probably nothing, my brother mentioned it when we were out yesterday.

lol yeah, my ST is to be thanked for all my car worrying, devil car :lol:

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Sounds like thermostat to me, very common problem.

What happens is it sticks open, allowing the coolant to flow through the radiator and be cooled down when doesn't need to. In town/traffic there isn't any air going through the rad so it stays at normal temp, but at speed the airflow through the rad cools the coolant right down.

Once up to temp the needle should sit in the middle of the gauge and stay there, no matter how cold it is outside or how fast you're going.

Edited by Alistair_GT
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Blast down the motorway will sort that out, start worrying when you have the same stuff on the dipstick :lol:

Or a massive amount of the oilcap gunk, filled to the brim and loads in the rockercover.

Edited by joe588
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