With advanced SYNTHETIC LUBRICANTS in your car's engine AND transmission you will improve its fuel-efficiency by 5-10%.
Using advanced (nano-fibre) filtration that synthetic ENGINE-OIL will last 4+ times longer than its petroleum equivalent. If your engine is not losing oil (burn or leak) this mean the higher priced product will lower your overall operating cost, and boost your ecological rating.
Besides, this technology will also halve the wear on your car's engine, make it easier to start in the cold, save battery wear, reduce exhaust corrosion, etc.
Many new cars come with synthetic oil as a factory fill, and many off-the-shelf lubricants are semi-synthetic, (for the semi-concerned ecological citizen). Speak with your garage when you next get an oil change . They probably know very little about it and just do petroleum lubes with paper-based oil filters.
The most comprehensive range of oils and engine oil-filters are available from AMSOIL: and no I don't have shares; a job; or a dealership with them. But I have been using their products for 25 years.