Leaking oil coolers and cracked cylinder heads often contaminate the cooling system with engine oil or diesel fuel causing the reservoir to soften and swell - often to the point that the cap cannot even be reinstalled.
Aluminum Overflow Bottle Reservoir Tank Fits Ford F350 F250 Excursion 6.0L 03-07
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Black Aluminum Overflow Bottle Reservoir Tank For 03-07 Ford F350 F250 V8 6.0L
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Aluminum Overflow Bottle Reservoir for 2003-07,06 Ford F350 F250 Excursion 6.0L.