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API oil codes

Discussion in 'General Tech and Maintenance' started by flydex28, Nov 26, 2006.

  1. flydex28

    flydex28 Senior Member

    Likes Received:
    Feb 18, 2003
    Oregon coast
    I was reading my chilton book and owners manual the other day and it says to only use oil that has is "energy conserving II" and with a grade of SG or SL can be used. I have been using Valvoline but it only says I think "SM" on the label. Whats the deal with these letters and what do they mean. It says do not use anything that does not have these letters. I was using 10W-30 but switched to 5W-30 last night. I think thats what I am supposed to be using anyways. Any comments on this? Any help would be appreciated.
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