Oil viscosity

[johnmonkey 4]

I was going over an old (1968)wisconsin engine manual and it said to put 20-20w oil in the crankcase in temperature between 15+ & 40+ degrees and 10-10w at temps between 0& 15+.In temps below 0 use 5w-20w. will 10-30w work? because I don't think that I have seen 20-20w or 10-10w oil.

[powermax_paul 1]

I think 10w-30 would be fine especially for an older engine. It'll be a little heavier at the higher end of the temp range, which is good for the higher internal clearances of an older engine. Paul

[Ron_B 0]

I have used nothing but 10w30 in my truck plows, both my tractors.Plowed a lot of heavy wet snow with no problem. Starts great at 10--20 below.--- Ron B

[TomSchmit 56]

I have search hi and lo for 5w-20 for extreme cold use. Never been able to find it.