At 90k and pre-sparkplug change I am planning my first shot at Seafoam...but forcast is for high of 35 for next few days...

Any reason why I should not do it in freezing temps?

 

Can't think of a good reason not to on account of cold weather. Just don't be tempted to do it in a closed garage. WAY TOO much smoke, not to mention the risk of CO poisoning.

Also, I'd probably do it with the engine hot/warm and not on the initial start-up.

Just a few thoughts.

Andrew

 

I'd make sure the engine was warm as well since the truck will want to stall constantly.
The solvent will also loosen better with the engine warm too.

Other than that you should be fine even in cold temps.