Their site shows these two options for my F-250 6.7L. There is a fairly significant price difference between the two. Both claim to be 100% synthetic. What is the main thing I'm giving up if I go with the Heavy Duty version?
Amsoil Signature Series vs. Heavy Duty
- Thread starter OFFRD
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HD is likely straight group 3 which is also 100% synthetic while ss has some pao but the quantity can depend. You'll be giving up a bit of everything with the HD but not like it would matter. Many engines go north of a half million miles on cheap conventional with very minimal wear and blow by.
Me being me I'd run either delvac extreme or Valvoline heavy duty diesel both in 15w-40 if i wanted something great for a great price. That's much better than the red jug conventional motorcraft diesel these usually get and they still last long enough. Walmart has both ready to ship for free for 22 a jug. Delo XSP is also good and I bought a few gallons a while ago. The Mobil one is available on shelf but the Valvoline one is online only. But if you want Amsoil get either.
Me being me I'd run either delvac extreme or Valvoline heavy duty diesel both in 15w-40 if i wanted something great for a great price. That's much better than the red jug conventional motorcraft diesel these usually get and they still last long enough. Walmart has both ready to ship for free for 22 a jug. Delo XSP is also good and I bought a few gallons a while ago. The Mobil one is available on shelf but the Valvoline one is online only. But if you want Amsoil get either.
Here's a link. Looks like 5W40 or 10W30 are the options. I usually tend to like 5W40 because winter here does get to 0°F or occasionally below, but summer gets above 90°F regularly.
I do NOT intend to go 15k between oil changes.
https://www.amsoil.com/lookup/auto-...ckup/6-7l-8-cyl-engine-code-t-t-diesel-turbo/
I do NOT intend to go 15k between oil changes.
https://www.amsoil.com/lookup/auto-...ckup/6-7l-8-cyl-engine-code-t-t-diesel-turbo/
Off the shelf 5w-40 oils that list the Ford F1 specification:
Rotella T6
Valvoline PBE
https://parts.ford.com/content/dam/...iesel_Motor_Oils_Meeting_Ford_WSSM2c171F1.pdf
Delvac ESP and Delo are not on the list. Funny, I don't see Amsoil on the list.
Ford's required specification.
Well Rotella is trash, so I guess I'd have to stick with the Valvoline PB that I've been running, or the Motorcraft 10W30 that's factory fill and also easily available.
What year truck?
The difference is composition. Base oil and additive package.
How many miles how long in time for your OCI?
Just because T6 has fallen out of favor for hopped up Subarus, lawn mowers, and crotch rockets doesn't mean it isn't perfectly fine for your truck. If it wasn't, Ford wouldn't approve it and plenty of trucks would be dead on the side of the road, including my dad's duramax. It's probably what I would use if I had a 6.7 PSD. (The full syn 15w-40 presently in my 6.7 non-PSD sump happens to be F1 approved.)
VPB is also a perfectly respectable lube. What are we really trying to achieve by switching?
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dnewton3
Staff member
Uh, no. Lets not bash a brand with the widest of paintbrushes.
There are plenty of examples of Rotella doing a fine job. I used conventional 10w-30 Rotella for years in my Dmax and it gave stellar results.
It may not be your favorite, but it's a brand that is respected in many circles.
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