I don't mean the 10/W30 . That's viscosity. I'm talking about the little circle usually on the back of the bottle.What do the ratings on motor oil mean ?
If you are talking the API Rating - Good reading
http://www.wearcheck.com/literature/tech鈥?/a>What do the ratings on motor oil mean ?
Ditto Mr. T
Mr t is right the other dude has trouble reading
10 winters ad 30 summers baisclly the lower the grade before the w sign is very good oil. if u got an old car 60k miles onwards just put 15w 40
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