When I said 10F that is the limit not what I would recomend!! I thought I should make that clear! I really like 15W40 HDEO!! When the highs start to be lower then 50-32F I start thinking about changeing. Once I hit 20F I would not consider any 15W oil at all even synthetics. I run my oil at least 6 months and once the temps start droping off -18 is not far away.
For winter Syntetic 0W30,3W30,5W30,5W40,10W30 are my choices. Once lows warm up to 32F I start considering 15W50,15W40,10W60 etc......... It is always best to play it safe dureing cold winter starts.
If you south of the mason dixie line run what ever you like because it will never get cold enough to cause any problems!
For winter Syntetic 0W30,3W30,5W30,5W40,10W30 are my choices. Once lows warm up to 32F I start considering 15W50,15W40,10W60 etc......... It is always best to play it safe dureing cold winter starts.
If you south of the mason dixie line run what ever you like because it will never get cold enough to cause any problems!