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Wife's tahoe. Mostly short trip driving with the occasional family trip / vacation. Some light towing of small trailer and ATV, but usually only a few times a year.

complete cooler line exchange.

Short tripped very often, and wife drives it like she stole it.

It's designed for use in air-cooled small engines, typically found in mowers. Spent too much on this ZT to worry about that Briggs motor laying down. Will do a few samples on the new oil to see how well it's performing.

Make/Model: Briggs & Stratton 500cc 16.5HP Vehicle: 2013 Gravely ZT34 Factory fill, dumped at 5hrs as recommended in owners manual. New fill is Amsoil ASE 10w30 with Wix filter. Blackstone comments: Aluminum and silicon are a bit elevated to compared to averages, but these things are probably...

2001 Kawasaki 2510 Mule Daihatsu DM950D Engine Submitting for a friend. Around ~800hrs had an issue where engine would not crank. Were told the crankshaft was cracked. Had it replaced between these two samples. Assuming unknown oil is Ac Delco 10w40 which is what their local shop prefers, but...

Make/Model: GM 5.3L V-8 Vehicle: 2004 Chevy Tahoe Mixed in a few quick OCI with the OE line to see if metals and silicon would come down. Still can't find the silicon entry point, but have gotten check engine light 2-3x recently for MAF. Switched from K&N, Wix, and now to Amsoil air filter with...

Went ahead and changed the oil & filter at exactly one year. Pulled much more over this year than any previous, and also moved closer to work so short trips were much more frequent. Dmax didn't seem to mind either Make/Model: Isuzu 6.6 Duramax LLY Vehicle: 2004 Chevy 2500HD Blackstone...

Make/Model: Transmission GM 4L60E Auto Vehicle: 2004 Chevrolet Tahoe Fluid was changed during this recent sample and refilled with same fluid type. Blackstone comments: Since this oil is the same fill as last time (just with more use), it's not surprising we found some higher metals. Nothing...

Make/Model: GM Differential Vehicle: 2004 Chevrolet Tahoe Fluid was changed and refilled with same type. Will likely try to get another 10K out of the next fill. Blackstone comments: This sample is looking pretty good. Wear metals are holding quite steady compared to last time, and that's nice...

Dumped the oil at 9500 as suggested by Blackstone. I'm going to run a couple short OCI to see if I can get silicon lower and then try again to extend beyond 10K. Make/Model: GM 5.3L V-8 Vehicle: 2004 Chevy Tahoe Code: OIL Ams SS Ams SS Ams SS 5w30 Ams SS 5w30 Ams SS 5w30 Ams SS...

I assume this is Dex III/Type III. The mechanic they are using used to work for the local chevy dealer. They only use Delco fluids.

Sample was done 2.5yrs after pan was dropped and AT refilled. This is a cattle feed truck used on a ranch that rarely if ever sees paved roads. Will probably run another 2.5-3yrs and resample to see how metals are faring. First sample was unknown mileage with unknown fluid, but based on this 2nd...

Donald, I'm not too worried about the TBN at 10K with this oil. Much more and I would agree with you. dnewton, this was his first and only UOA on the truck. I agree, wish I had a little more background on the Fe. Hopefully I can get him to run a few more and see improvements in the metals and...

Owner previously maintained 5k mile OCI using Valvoline Premium Blue. Will suggest he run the 10K on this fill as indicated by Blackstone, and then push him to switch over to AME. Make/Model: Cummins ISB 5.9L Vehicle: 2004 Dodge 2500HD Code: OIL DEO 5w40 MILES IN USE 8K...

This was mostly highway miles so I did expect the numbers to improve over the previous runs. I'm still surprised that I'm not getting more miles out of the oil though. I can't tell if the limitation is the oil, the GM 5.3, or my specific engine... Oil and filter were not changed, will continue...

This run was after a little over a year in the engine, oil was drained and replaced at time of sample. This vehicle is used as a cattle feed truck at a ranch in central texas, bed has a feed hopper installed. Unless driven to the feed store to refill, the vehicle rarely sees anything other than...

Oil was drained and replaced with another round of Amsoil SVG at time of sample. Nice to have a starting point since the first was the flush from the previous owner with unknown mileage/history. Make/Model: GM Differential (Front) Vehicle: 2004 Chevrolet Tahoe Code: OIL Amsoil...

Oil and filter were not changed at the time of sample. Engine hit 76hrs in just over a year. Thinking of running another 6-12 months and re-sampling. Thoughts? Make/Model: Shibaura/Northern 1.5L 3-cylinder Diesel Engine Vehicle: 1997 New Holland 1925 Tractor Code: OIL Valvoline...

Originally Posted By: hisilver Dhellman- did you notice any "pump rub" when you got inside your t-case? I have the NP 261 in my 1500. I don't know if I'm in danger. I certainly did, but looks like it had not yet damaged the case too badly. My wife's tahoe has the NP-8 which failed due to pump...