discolouration

Anyone had any problems with the plastic headlamps discolouring? Mine were pretty bad when I bought the car ('05 350). I used a Meguiars headlamp lens renovation kit which cleaned them up pretty well but now after a few weeks in the sun they're starting to discolour again. Seems to be UV...

Hello all. I will keep this as brief as possible. Are your headlamps still looking like they did the day they came out of the showroom? Are they looking a bit sorry for themselves? Spoiling the look of an otherwise very well looked after vehicle? Mottled and patchy or looking a bit yellow...

On my E230 the top of the engine has a yellow tinge to it. Is this just oil that has leaked and burnt on?