Yellow Liquid & Garage Condensation
Discussion
throwyourbike said:
Nope, never found out what it was.
I still own the car and it has flown through 3 MOT’s since then with no problems though.
I can only assume it must have been condensation which became contaminated with something.
I did some more digging on the internet and found this...I still own the car and it has flown through 3 MOT’s since then with no problems though.
I can only assume it must have been condensation which became contaminated with something.
95 per cent of the exhaust systems built today are made up of iron alloy and galvanized steel. Exhaust pipes are made of either iron or stainless steel. Heat shields are made of galvanized steel and galvanized steel uses zinc as a rust inhibitor.
Zinc, when hot and in the presence of iron and a catalyst, creates yellow zinc oxide in the form of crystals. The connection is the catalyst - salt water - or compacted snow with road salt mixed in. If the snow is able to touch the exhaust heat shields and the exhaust pipes at the same time, the chemical reaction between the two dissimilar metals creates the bright yellow crystals.
I've also posted on the Porsche forum and have been told there that my heatshields are aluminium suggesting this doesn't apply, but there seem to be too many other tales on the internet of yellow liquid under the exhausts of all sorts of car makes where this is the accepted cause. Since reading the above I also recalled that the last time I drove the car before seeing this was in snow/slush for some distance so the snow/salt/high exhaust temp all follow.
I'm no chemist but I'm pretty satisfied that there is some kind of reaction between components of or near the exhaust causing the liquid, so I can get back to enjoying the car now :-)
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