Came across this video today. At 14.20 he explains about fuel additives. the whole video is about 17mins long and well worth a watch if you have the time.
Lots explained about oil.
https://www.youtube.com/watch?v=6VLMfUz34R0
Lots explained about oil.
https://www.youtube.com/watch?v=6VLMfUz34R0