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Does UOA not show whether or not the oil isn’t staying staying in grade and if there is an abnormal amount of wear metals in the oil? If UOA doesn’t give meaningful information in these two departments, why is anyone doing it?

I’m just thinking about the physics of oil film reapplication. I just reason there is a sweet spot in particular applications where too thick is bad and so is too thin. It’s known that thicker isn’t always better for every mechanical application. I’m speaking to if the oil stays in grade...

What attributes account for this development? Obviously this graph is about piston ring wear, so what is it that makes HTHS at 130C not have any substantial difference after 2.6?

Thank you for this input. Since I'm going down the rabbit hole, where does the 3.5 mininum HTHS for turbo engines come from? Not as a point of doubt, just bored on a Sunday looking to educate myself. Also, I guess I'm curious about what thresholds for viscosity need to be minded when it comes...

7.3 at the 1600mi UOA and 7.23 at the 3300mi OCI. Compared to the 6.9 coming out of the factory fill at 500 miles, we already have some improvement. The next OCI will be at around 4400mi and I feel confident based on the trend from 1600 to 3300 that it will still be in grade. As I understand...

Based on what I've seen with regards to 0w20 vs 5w30, as long as the 0w20 is staying in grade, there is no meaningful reduction in protection. 0w20 should, theoretically, be more shear stable, so as long as it's not getting cooked and I keep up the proper OCI, I think it's probably going to be...

What's the overall elevation change between destination and location?

I plan on continuing UOA throughout the year to be sure that 0w20 is suitable for the summer. My next oil change will be around 4.4k miles to the oil and we'll see if the results hold up. 3500mi gave this good result, so that's a good baseline that I'm comfortable with if it needs to be that...

Wind. Every 1mph of headwind/tailwind is worth about 1.5% fuel efficiency (simplified math). If you had a headwind one trip and more favorable wind the next trip, you're going to get different results. I drive a truck for a living, often doing the same routes week in and week out and I've...

Back with an update for the latest oil change. As a reminder, last time, I installed the aftermarket oil pan which increased capacity and provided a more complete drain. Obviously, during the installation, that drain was about as complete as it could be. I also took this sample from the drain...

Lots of great input here. I really appreciate the part where you specifically call out oil temps to be mindful of. I always run with my dash displaying the Ts and Ps, and so far I haven't been above 210F. I'd say greater than 90% of my driving is just casual and usually it's around 183-188F...

It didn’t seem to specify anything like that in the manual.

Valvoline Restore and Protect 0w20, 1614mi (break-in, after 503 miles on factory fill), 2026 Nissan Z VR30DDTT (2117mi) I purchased this vehicle new in January as my new "daily driver" and road-trip machine as I am only home Fri/Sat/Sun. I tend to drive for efficiency/comfort (averaging...