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Originally Posted by Bad Boy
Z1 begs to differ, it says I should get an extra...?
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Not quite... unless you are planning to remove the rear diff cover (i.e. if you are installing the finned diff cover). Two should be fine since a normal drain does not completely empty the diff, as mentioned.
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Originally Posted by Z1 Website
2 of these 1 quart bottles needed to change the fluid in your differential. If you are removing the rear cover, we recommend purchasing a third bottle as the actual capacity of the differential is 2.25qts. During a drain and fill you will never be able to completely empty the differential so 2 bottles is sufficient.
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