1999 f550

[homerbw]

I am getting ready to change the oil and found I have 6 quarts of 20W-50W STP brand oil which need to be used. Would it be a problem using it in my 1999 V10 Triton?

[Waiter21]

HUM... Thats fairly thick, I used 20w50 in my airplane, it was an air cooled engine.

In my MH, depending on outside temperature, .. I'd probably use 1/2 of it mixed with 5w30.. i.e. use 3 qts of the STP and 4 qts of 5w30..

[spyderRV]

Save it for the generator in the summer. Way too thick!