what does 1.5 litres of 0w40 engine oil weigh in grams?

Answer 1

You need a little more info to be accurate. Temperature has a big affect on the density of motor oil. Assuming 21° C (~70 ° F) this oil will have a specific gravity ( relative density) of about .85. This means that it is 85% the weight of the identical volume of water.

1.5 Liters H20 = 1500 cc = 1500g

So for your oil ...1500g x .85 = 1275g

Answer 2

The specific gravity of 0W40 engine oil is 0.85, therefore it weighs:

0.85 x 62.4lb/cu.ft. /28.31685 liters/cu.ft. = 1.8731 lb/liter

1.5 liters x 1.8731 lb/liter x 453.5924 g/lb = 1274.44 grams