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I haven't really decided at that point. I'm about to clean the Amsoil air filter at the 25K mark and want to see how the silicon numbers trend on the next round. I was expecting to see a slight improvement...

I did top off with the same oil. The 2.5QT total add was split between 3 different adds within the 10-15K range. No oil has been added/needed since the 15K mark. This was also the first run on the Amsoil EA air filter, all previous runs were with K&N. Doesn't look like much difference in silicon...

Submitted this oil sample right at a year hoping that I could squeeze 25K out of this fill. Based on the results now I'm wondering if I shouldn't be extending this longer? I will probably still replace the Amsoil oil filter at 25K, if not oil & filter. Make/Model: Isuzu 6.6 Duramax LLY...

Dropping the K&N at 133K miles seems to be paying off with the steady decline in Silicon. I will be running this oil for another 4 months (~4K miles) and checking back in to see how things are looking. Make/Model: GM 5.3L V-8 Vehicle: 2004 Chevy Tahoe Code: OIL Ams ASL 5w30 Ams...

On the 04 Tahoe I switched in the middle of an oil run from K&N to a Wix and started noticing an improvement on silicon numbers (K&N was 46ppm @ 9K, Wix was 38ppm @ 10K). I'll be doing another UOA on it next month after 8K miles on the new oil (~17K on the Wix) to see how those compare to the...

2nd ever UOA sample. Oil was not dumped at time of sample, but was after receiving results. This is the 2nd GM 5.3L with high silicon, and can't seem to figure out why? This one is still running a K&N air filter in the stock air box. Make/Model: GM 5.3L V-8 Vehicle: 2005 Chevy Tahoe Code...

See the oil leak comment above...

See the oil leak comment above...

Around the 5-6K mile marker the owner had a rear main seal leak in the engine and had the gaskets replaced. I believe that is mostly responsible for the large spike in Silicon, although the high wear numbers also indicate that dirt could have been dumped in the engine during this work...

With regards to the boron and phosphorus, please see the mileage of the tests. All 3 were done with their own fill of ATF.

3rd AT UOA on this Tahoe. Fluid was not changed at the time of sample. Blackstone comments provided below. Make/Model: Transmission GM 4L60E Auto Vehicle: 2004 Chevrolet Tahoe Code: OIL Amsoil ATF Amsoil ATF Unknown MILES IN USE 15,030 10,010 Unknown MILES ON UNIT 148K...

2nd rear diff UOA on the wife's new to us Tahoe. Oil was changed at time of sample. Blackstone comments at the bottom. Make/Model: GM Differential Vehicle: 2004 Chevrolet Tahoe Code: OIL Amsoil 75w90 Unknown MILES IN USE 25,128 Unknown MILES ON UNIT 148K 123K SAMPLE...

2nd ever UOA sample. Owner maintained 5k mile interval using Rotella 15w40. Oil was dumped at time of test and refilled with Amsoil OE 15w40. Make/Model: Navistar 6.4L V-8 Power Stroke Twin Turbo Vehicle: 2008 Ford F-250 Code: OIL Rotella 15w40 Rotella 15w40 MILES IN USE 5049...

Agree with Pablo, for 1.6x the results certainly look like a step in the right direction to me. Looking forward to the next oil analysis. As far as the cost, let's do some math. User was doing 3K intervals with Ford Motorcraft and spending about $120 per oil change. At 15K miles a year that's...

2nd ever UOA sample. Owner increased from 3K mile intervals using Motorcraft 10w30 in this first fill with Amsoil OE 15w40. Oil was dumped at time of test and refilled with the same flavor from Amsoil Make/Model: Navistar 6.4L V-8 Power Stroke Twin Turbo Vehicle: 2010 Ford F-350 Code: OIL...

All tests were against the same fill of Allison/Castrol Transynd. Fluid was changed during the last sample and replaced with Amsoil Multi-Vehicle ATF. I'll probably run this up to 50K before doing my next sample. Still don't understand why the viscosity was so much lower than what Castrol states...

Valvoline uses Sodium in their add pack. It will continue to come down as the old oil gets drained out.

I'm not sure the frequency, but I believe he carries 3 wix paper air filters so he can blow them out and rotate until its time to replace.

The silicon is explained on how the truck is used, gas/oil field. 30 miles off road to a job site in high dust conditions, I don't see this as an issue with air filtration. Under the conditions I think it did just fine. Note nothing on this report was flagged as a concern. I'm going to wait for...

Did you guys see the valv viscosity at 3k? It didn't hold up...