Well I use a big squirt and plently of them.
A can of Lithimum grease does about 4 to 6 mowers however it comes out of the labour charge along with nuts, bolts , washers & clips.
While it is ethical to charge for shop supplies adding a "mystery item" to a bill is not a good look.
What next 15 strokes of the grease gun at 0,50 / stroke ?
I just spent $ 600 on new grease guns , should I add more becaise I just bought it ?
Down here those parts prices are all less that my wholesale cost of aftermarket parts.
Genuine K filters are $ 35 wholesale and K oil is $ 15 / l or about $30 / quart again wholesale so add another 35% to get customer pricing.
Labour prices are not regulated.
The glass front showrooms charge out labour at $ 120 / hr. They justify it as 1/2 of that is the rental valve of the space the work bay occupies, a valid point as we have the greedyiest landlords in the world down here.
Most repair only shops charge out at $ 50 to $ 90 / hour