As a manufature of lubricating oil, plastic bottles are a common sight in the plant. Recently the price of the plastic bottles and pails that we purchased has increased tremendously.
I did speak to our plastic bottles' supplier with regards to this increase. They are trying their very best to reduce the cost of the bottles by using recycled materials like HDPE Pellets in producing the bottles.
So, please don't just throw your plastic bottles in the rubbish bin; recycled them. It will help to reduce the cost of your car oil too if we buy them cheap. :)