I just bought a husqvarna riding lawn mower (LGT2554)and am confused about what type of engine oil to use. One part of the manual says to use SAE 30 above 32 degrees and another part of the manual says to use 10W-30 above 32. I looked underneath the hood of the lawn mower and on a sticker it says oil spec of 10W-30. In the past, with other mowers, i've always used plain SAE 30. Which type of oil is recommended, SAE 30 or 10W-30?