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Yeah. I checked the oil when I bought it but it was fresh. Bought it from a dealership; and they had changed the oil as part of their “pre sale service”. (I’m reasonably sure that’s the only thing they did, it was due for a lot of other stuff which I took care of when I got it home. Trans fluid...

This is my first GM product in quite a long time and my first V8 GM product. I’m learning that it’s kind of a pain to have something with an engine that was produced for such a long time and has so many different (but only SLIGHTLY different) variations and versions.

Well, I have bad news. They reached out today and want the filter back. Had I not checked my e-mail, I was going to open it up while I was home for lunch today. But; alas, I did before I left the office and obliged. So I’m sending them the filter back. Hopefully y’all don’t hate me too much...

I think you’re misunderstanding the difference between compression and compression ratio. For one, you noted “when new”. Compression RATIO doesn’t change with wear. Compression ratio is the difference in volume in the cylinder between the piston being at the top and at the bottom of the stroke...

Yeah roughly what they are now since the filter was changed.

Huh? I answered your question in my last reply with what I paid. And, no, peak performance isn’t with 87. Compression ratio hasn’t been the end-all be-all for 40 years. 105 octane fuel allows for the ignition to advance far more giving additional power.

I got gas today and E85 was $2.29 and 87 was $2.86. It varies though. Sometimes the prices are closer and sometimes they’re further apart. I use an app called “Road Trip” which keeps track of cost per mile, and right now I’m averaging right around 21 cents per mile regardless of which fuel I...

9.6:1. Those are GM’s advertised numbers for the 5.3 on E85 vs regular gasoline. There’s more than just compression ratio that affects a modern engines performance. In the 5.3, it’s a combination of the variable valve timing and ignition timing. A sensor detects the alcohol content of the fuel...

In what world is 326hp “considerably less” than 320hp? Or is 348 ft/lb “considerably less” than 335? While it can vary based on platform (I don’t run E85 in my Focus for example), the 5.3 from GM takes advantage of the very high octane rating of E85 and makes more power with it. Power is the...

Fewer emissions, cleaner burning in the engine (less carbon buildup, can actually help remove carbon and other deposits from within the engine), additional horsepower and torque, importing my fuel from Iowa instead of OPEC, etc.

Hey friends! My metal snips are AWOL. Looked all over! I recently moved and fear they didn’t move with me. I’ll order some more. When they arrive, I’ll show you guys the inside of the filter. I sent Amsoil an email about the discrepancy in their recommendation for 2013 and 2014 models...

Could be. I need to explore the pickup screen.

Well, one challenge here is that we’re not in the extended drain territory. I changed the oil at 117,065 and I’m currently at 120,462. 3,397 miles. OEM drain interval is 7,500 miles. Actually; technically, the manual says to “check oil life percentage and change if needed” at 7,500 miles...

Gotcha. Hmm. Well I’ll explore it for sure. Having an oil pressure gauge is handy here. I have an indicator on the dash, in essence, that should let me know when the filter needs to be changed again.

Yes, miles, sorry about not clarifying. That certainly makes sense. Pretty shocking pressure difference (almost double). I sent Amsoil an email to suggest they review recommending that filter on 2014 models but not 2007-2013 models; which has to be a mistake. It’s the same generation. It’s...

We have a winner! I pulled out of the garage with 21 psi cold. Swapped the filter. Had 38 psi at idle pulling back into the garage. Another EA15K50 is what I had on hand so I’ll order a wix and do a full oil change when I hit the 5k mark on the oil. Fascinating! Thanks everyone! I would’ve...

The oil level was higher after adding a quart than before. I didn't get PRECISELY one quart out I guess. Could that have had an impact? It went from being midway up the hash marks to 3/4 up the hash marks.

5.3, towing approximately 1,200 pounds. Oh interesting. That's what they recommended on the website. Aha! If I list 2013 instead of 2014, it does not recommend that filter. In 2014, the 5.3 was updated in the Silverado models. But the Tahoe remained on the older GMT900 platform that year and...

So in that scenario, would that mean it's time for an oil change? Or does it still have life left?

Amsoil EA15K50