Low oil pressure in drive but good in park???

[crazy4offroad]

Variable viscosity. the 15- means after it warms up it will have the weight of 15 weight oil. 40 weight at start-up. SAE 40 or 30 will have that main viscosity all the time.

 

[89Suburban]

Holy ****. So our diesel trucks run hot on 15 weight? I learnt sumtin today. I also learnt my tired Burb runs on 5w hot.

I never realized that.

 

[crazy4offroad]

No no no. After the truck warms up, the oil thins out to the equivalent of 15 weight.

 

[89Suburban]

No no no. After the truck warms up, the oil thins out to the equivalent of 15 weight.

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[HotRodPC]

What's wrong with throwing the farm oil in it, 15-40?

Multigrades are thinner.

 

[89Suburban]

Multigrades are thinner.

So a straight 40 weight hot will be thicker than 15-40 hot right?

 

[crazy4offroad]

Yup.

 

[Kapdin]

i over reacted...... installed new sending unit and pressure is good and solid from 10-30 and running down the road at about 15.

 

[HotRodPC]

i over reacted...... installed new sending unit and pressure is good and solid from 10-30 and running down the road at about 15.

Un huh !!! And what did I say about getting another guage to verify??? Glad it all worked out. Good news. New sender is much cheaper than a new motor.

 

[coreys87]

My truck runs 50 psi when cold at idle. When warm at 190 degrees about 2-3psi at idle lol

 

[coreys87]

And its actually "suppost" to be 15 weight in cold and 40 weight when it warms up. You had it backwards