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98 V90 Expansion Tank Cap S90-V90

I have what I believe is the Volvo original green expansion tank cap on my 98 V90. I have had no issues in the 6 months I have owned this car. I have a grey expansion tank cap from my previous 93 940. I have read negative things about the green cap and it's pressure rating(to high??). Should I leave well enough alone or change to the grey cap? It is the original radiator, Nissens I believe.

Thanks!
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94 940 106K ,98 V90 96K








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    98 V90 Expansion Tank Cap S90-V90

    actually, can you give me a little background info on these colored caps? I just had to have my CEL turned off due to a bad gas cap. Turns out the previous owner had a generic cap installed. I wonder if they had any problems with the old one, or just plain lost it.







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