Palangi,

THe disc is the full flow part and the Tractor filter is the bypass part of the filter system. Without the disc in the filter housing you are not filtering most of the oil going into the bearings and other parts of the engine.

So I suggest you put the disc filter back in.

I don't see any problem with 10W30 oil in cold weather but not when its hot. Why not use a 5W40, 15W40, 5W50 or 15W50 all year long.

P E H