I'm using 5w-20 Amsoil XL, thinking about running 5w-50 that they run in new mustangs.

 

Unless you plan on running your truck around a road course, there is no benefit. That stuff is expensive, and is only needed in the most extreme cases.

 

Mobil 1 5w-20 and filter every 6 months. Use the truck for landscaping and plowing


-matt

 

Synthetic or blend? I have 1200 miles and will be doing one at 1400 and want to go full syn.

 

Full synthetic regardless of miles I do it at 6 months.


I have AMSOIL in everything else (trans, T-case, Front diff, rear diff) I just cant justify using AMSOIL in the engine.

 

I have been agonizing over using 5w30 in my 6.2l. I would not consider a 50 weight oil in an engine calling for 20.

 

You can use ANYTHING as long as it meets the spec. That means 5w20 and API SN. Whether it's the most expensive brand out there or store brand from Wal-Mart your truck will not care. Synthetics are great for easier cold starting and the ability to run longer, but that's about it.

 

So pretty much 5w20 synthetic is the oil to use?

 

I'm doing my first oil change at 2000 miles. I'll be using Mobile 1 5w20. I want a little better oil than the blended stuff. About $10 more for the synthetic oil, but IMO, worth it.

 

You might as well use full synthetic! Most sports cars vett, beamers have used synthetic for a long time. I've ran Amsoil for the last 20yrs! In cars, trucks,a tv, jet ski, sleds. No problems!

Hey Tom! Truck less ? Come on buddy truck up!

 

Working on that, wife is a full time student and I have three kids to pay for. Hope to have that fixed by the end of the year.