Beteszem ide is, látom itt nagyobb az aktualitása:
"Q: I've been told that by adding additives to my engine that it will last longer, any truth to this?
A: Unless you drive or operate your Toyota in some extreme or very harsh environment you do not need to add anything extra to a good brand of motor oil. The quick lube places, for all the bad they do, have educated us to change our oil and filter at 3500 mile intervals. This is more than adequate for 95% of all drivers without adding anything to the oil. The major oil companies add all the additives to their oil that you would add from off the shelf products, so save your money."