If I am using Lucas oil for my for my 10 bolt rear end how many quarts do I use? Lucas already has the additive in it. When I searched i found someone saying to use 2 quarts plus the additive so I am just wondering how many quarts that adds up to? Thanks

 

Use however much it takes to fill it.

 

So far there is 4 quarts in there and that almost seems like to much.

 

You're filling it to the bottom of the fill plug hole?

 

Yes those were my intentions but it just seems to keep taking in oil??? Something doesnt seem right!

 

Most automotive diffs take 2-3 liters/quarts

You are filling through the plug on the side of the housing?

 

Yes I am filling through the plug on the side of the housing. Is it OK to run it with 4 quarts or should I take some out.

 

So what do you guys think, should I drain a quart out on my rear end to make it 3 quarts or should I leave the 4 quarts in there? I cant think of anything bad happening with 4 quarts of oil and it never over flowed out of the fill plug so maybe the rear end can hold 4 quarts. I know nothing about rear ends by the way!

 

It's not possible to overfill it.