There are all these additives which make many promises.
What do they actually do, just thicken the oil a bit?
For example, what does a product like this do:
http://www.wynns.co.nz/wynns-product.php?n=1&g=1&s=2&id=208
What do they actually do, just thicken the oil a bit?
For example, what does a product like this do:
http://www.wynns.co.nz/wynns-product.php?n=1&g=1&s=2&id=208