For my rides, I get it from the dealer. One difference to consider between dealer and parts store: o.e. coolants contain an extra additive called Bitrex. This embitters the coolant, making it taste nasty to anything that tries to consume it. Coolant consumption will kill or at the least take out your kidneys. If you have pets, nose miners or other critters around you may want to consider this. I have pets and there are some rodents around that I don't want my furry buddies to ingest if they got into coolant.