hi there i saved a post about the pressure rating on the resivoir caps but i dont know how to put it up here. here is basicailly what is says.
grey cap= 150 kpa
green cap= 150 kpa
white cap= 100 kpa
black cap= 75 kpa
this was posted from fitz fitzgerald. the way i understand it the caps will let of pressure at different pressure levels . so it looks like the in towing you might want the green cap. but for my average driving i might want a black cap. i guess i want the cap to let off pressure before the radiator takes the brunt of the pressure. and possibly the head gasket. this is something to think abut. good luck.
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