Same amount of emissions when the lower fuel mileage accounted for. Considerably lower power. Engines run on unleaded fuel hardly have any carbon or other deposits. We do not import much OPEC oil these days.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.
In what world is 326hp “considerably less” than 320hp? Or is 348 ft/lb “considerably less” than 335?Same amount of emissions when the lower fuel mileage accounted for. Considerably lower power. We do not import much OPEC oil these days.
What compression ratio we talking about? Where you get those numbers above? E85 should have enough octane to run 15:1. Anything else is wasted octane and lower energy content.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 most common reason people use E85. While there’s less energy in a quantity of E85 than a quantity of gasoline (hence the poorer fuel economy), the high octane rating, low carbon and low temps allow for an engine to really crank out the power. ESPECIALLY boosted engines.
9.6:1. Those are GM’s advertised numbers for the 5.3 on E85 vs regular gasoline.What compression ratio we talking about? Where you get those numbers above? E85 should have enough octane to run 15:1. Anything else is wasted octane and lower energy content.
Two final questions. E85 is nada available where I am. What it cost compared to regular unleaded? And can you send a link showing where GM claims higher power with E85.
Only if the pump is in relief. If the flow volume doesn't change, then the pressure won't change if the oil temp/viscosity is constant.If the pressure is measured after the filter (which it usually is), if the pressure drop across the media is significant, you will see it on the gauge.
That coincides with the draining of a quart and adding a new quart of oil.It's most likely some permanent shearing of the VM/VII additives. As they get chopped up, especially under high load, they're less effective at slowing the decrease in viscosity with increasing temps. Lower viscosity with give lower oil pressure.
Does this engine have a variable flow oil pump? Filter must have been clogged enough to put the pump into relief, which would reduce oil flow and therefore oil pressure at the sensor.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 just changed the oil and wouldn’t have even CONSIDERED that the filter (which incidentally would’ve been changed as part of the oil change) was the culprit. I’m really glad I asked.
Did you notice what the oil pressure readings were at full hot idle and higher RPM when you first got the truck before your first oil change? Just curious.Hey folks!
Bought a used Chevrolet Tahoe (2014). Changed all the fluids when I got it, all with Amsoil. Amsoil Signature 10W-30 in the engine, Amsoil filter.
After about 3,500 miles (including a 1,200 mile towing trip) my oil pressure has dropped pretty significantly. From around 28psi at idle and 42psi under acceleration, to 19psi at idle and 35 under acceleration.
Huh? I answered your question in my last reply with what I paid.2014 Tahoe with 9.6:1 compression when new. Yep, peak performance with regular unleaded gasoline. Cannot even tell us what he pays for his glorious E85 fill up fuel?
What would the oil filter have to with the pressure drop?
Nothing wrong with using the EaO, it's an excellent filter, the problem is your engine appears (please confirm with a filter tear-down) to be filling the filter with particulate, likely due to cleaning.
I'd probably use a less expensive filter changed more frequently if the filter dissection confirms my suspicions. You can step back up to the EaO once the loading starts to taper off. AMSOIL advises not using the EaO in these applications (and the HEMI) due to loading issues over extended drains. The filters are extremely efficient and these engines produce enough contamination apparently to be an issue when trying to run the filter that long.
I look forward to your filter C&P pictures!