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hey guys but im going to ask a stupid question but what does the SL stand for ? guess im not up on the oil thing but i just have always used valvoline oils and this year since im burning e-85 i went with the full synthetic syn power 20-50 --- it does have the note saying that it exceeds api services SM/SL,CF,ACEA SERVICES A3/B3/B4 and all preceding api&acea categories ? any thoughts on this
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