[1.7] register two equal fluids

hey,

I want to add oil and it should be compatible with buildcraft oil.

Could I play with 2 oils at the same time?

And if not, how can I activate buildcraft oil if buildcraft is installed?

ModFluids

public class ModFluids {

public static final Fluid oil = new Fluid("oil").setDensity(800)
		.setViscosity(10000);

public static void init() {
	registerFluid(ModFluids.oil, "oil");

}

private static void registerFluid(Fluid fluid, String fluidName) {

	if (!FluidRegistry.isFluidRegistered(fluidName)) {
		FluidRegistry.registerFluid(fluid);
	}
	fluid = FluidRegistry.getFluid(fluidName);
}
}

ModBlocks

public class ModBlocks {

public static final Block oilBlock = new OilBlock(ModFluids.oil, Material.water);

public static void init() {
	GameRegistry.registerBlock(oilBlock, "oilBlock");

}

}

Moditems

public class ModItems {

public static final Item oilBucket = new OilBucket(ModBlocks.oilBlock);

public static void init() {
	GameRegistry.registerItem(oilBucket, "oilBucket");
	FluidContainerRegistry.registerFluidContainer(FluidRegistry.getFluidStack("oil", FluidContainerRegistry.BUCKET_VOLUME), new ItemStack(oilBucket), new ItemStack(Items.bucket));
	BucketHandler.INSTANCE.buckets.put(ModBlocks.oilBlock, ModItems.oilBucket);
}

}