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There is nothing wrong with your 21 PPM Iron. Newer engines shed more iron. Your Fe will come down, it probably already has as you have no lab results from the first 20,000 miles. There really are to many hidden variables to place much value in the data you are collecting. Your sample looks great.

Fleetguard LF 16035s are made in Mexico. What specifically are you not impressed with? My Ram was assembled in Mexico, best and tightest truck I've ever owned.

All Major brand oils have differences. Base oils, additive packs etc. What is really important is the end result that oil gives you.

Discount tire bought Tire Rack last winter.

The Subaru oil has lots of Moly in it, good stuff. Moly is what ya want with the direct injection gas engines, especially if they have a turbo

My guess is that these people don't whine much. I'm sure they should make more than they are paid. They are very used to being on their own so to speak.

10+ gallon oil sump on most class 8 trucks, lower RPM's, lots of highway usage. My Ram only has a 3 gallon sump but the oil tolerates a lot more abuse than most any SN oil. Especially pulling through the mountains.

Valvoline Premium Blue Diesel 5W-40 with Amsoil EaO 80 filter. 3 gallons

I had 2 defective EAO 80 filters that Amsoil promptly replaced after seeing the lot numbers. Great customer service.

Hoarders

No not impressed with the new made in Mexico EAO 80 filter from Amsoil. Louvers are just little slits, fit for the trash.

This oil is targeting Heavy Equipment and Farm Machinery. They don't give a hoot about our diesel pickup trucks or off roading.

Seems like everyone but Valvoline has come out with a Synthetic 15-40

2016 Ram 3500 SRW 6.7 89,880 miles Amsoil Sig. 5W-40 Fleetguard LF 16035 Tow, 5000 miles per year.

The air that is being displaced while filling has to go somewhere.

You live in California, how frigid does it really get there? Be kind to your engine, that Delvac Extreme full synthetic 15W-40 is great oil and gave you good results. If it aint broke, don't fix it.

LOL...Chevron is interested in fleets, not DY self folks like most of us. Nothing is free.

I now send mine 2nd day air, UPS or Fed Ex. Put it in small box. Kind of expensive bot WTH I drive a $50,000 truck. Bye the way, I'm retired from the USPS. I avoid them regardless of cost.

Why would you run a heavy Diesel oil in a Boxer engine??

We simply have a whole bunch of corn here. Male Corn and female corn.