What engine oil do you guys run? Right now I'm running valvoline synthetic blend 10w30

 

Whatever is on sale at auto zone! haha, on my other younger/nicer cars i run only mobil products. This old rig... yea, whatever is on sale.

 

Castrol 5w-30 syn in the cold temps, 10w30 syn in the warm temps.

I used to run 5w-30 all year round but as my miles have been racking up and the hotter its been I really should be using the heavier grade oil but I still ran 10w-30syn in the winter with no ill effect.

 

I've heard amsoil is the best of the synthetics.

 

Its also as expensive as Royal purple. Unless you run a HP engine of some kind under allot of high RPM's or carry allot of loads I don't really see the need to use that expensive of oil. Even with conventional oil I've seen a couple of these trucks with almost 300k miles on them.

 

Am soil has a rep of being the disappearing oil as well. Allot of motorcycle guys use it, but experience low oil levels after short term use. I ran it on my Suzuki and lost 1/2 qt in 500 miles. Went back to WalMart supertech 10w30 full synthetic and no more low oil levels. Running it in my 4.9 with great results. About 1/2 qt. low at 8k miles. $3@qt!

 

WalMart SuperTech 10W40, with either a Wix or Motorcraft filter.

 

I run the BOSCH filter from Walmart. Empty that thing has got some weight to it and I usually cut open my filters too see what I've picked up.