“This is a really good article by AMSOIL on 5 myths of motor oil that are not true!

• When motor oil turns black it must be changed
• You must change oil every 3000 miles
• You can’t mix synthetic and conventional motor oil
• Once you switch to synthetic you can’t go back
• Synthetic oil causes engines to leak oil

Also, there is a good video with Gale Banks on “what’s in synthetic motor oil’!”