Posted by Gambles on May 02, 2012 at 04:41:37 from (24.246.215.127):
In Reply to: Enlighten me! posted by Straw Boss on May 01, 2012 at 21:54:47:
Whenever they supposedly improve a specification of oil, they increase a letter. Latest and greatest spec is SN. Your power mower engine was manufactured before the SN spec came out, so it won't specify the SN spec. Actually, to preserve catalytic converters in cars, they have taken out a lot of the zinc and phosphorus for the SN grade, as compared to the SL or SM oils, so a SL or SM might even be better for your mower, even though the SN is the latest. It probably really won't matter, as you said, it's better to change it than not change it. Just don't put a non-detergent oil in your mower, like the salesman told my mom and she still has the urge to put that stuff in there, despite what the owners manual specifies.
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