I’ve been running T5 for 200k and nothings blown up. T5 is a synthetic blend anyway, you’ll be fine switching.

 

LOL. Thanks. That's what I needed to hear.

 

Or switch to Dino , I have run both in 15-40. I only change it once a year now so its been T6 ,or whatever synthetic I could find this last time last spring . Before that for first 5 years it was Rotella T4 every six months .

 

T4, T5, T6... it really doesn't matter but some make you "feel" better so...

There are other full synthetics you can use too if you can't find T6. I del Chevron offerings pretty regularly where T6 is always gone.

 

T4, T5, T6... it really doesn't matter but some make you "feel" better so...

There are other full synthetics you can use too if you can't find T6. I del Chevron offerings pretty regularly where T6 is always gone.

I think a large majority of people use synthetic because they believe it's better. Not because they live where the below 0° temps dictate it.

 

I’m glad I live in the North so I can justify my desire for expensive synthetic.

 

And yet they don’t even “recommend” it for 4th or 4.5 gens. And there’s a lot of engines that have outlived their trucks that run Dino oil.
Better, sure. So you can get 600k out of an engine rather than 500k, when either way the truck will likely be on its 7th owner and a steaming pile of junk by then?
Cost benefit ratio.

 

Maybe not cost effective, but I run synthetic in several vehicles that doesn't call for it.

Basically, it turns into "time effective" when a vehicle actually starts when it's -10 or -20, largely thanks to that the engine turns over much easier. If things then also get better lubrication, that's icing (no pun intended) on the cake.

 

From the 2018 Manual, no it doesn't call for Synthetic for 0 degrees and up. CK-4 is the spec they require.

If I had to guess why it says "Synthetic" on 5w, it's because they don't make 5w in non-Synthetic.

Anyone every investigated what makes synthetic, "Synthetic"? its a hoot.