- Joined
- Jan 5, 2025
- Messages
- 19
It's been a minute since I posted on this forum. I'm more of a stalker. Since my last post, my Jeep has acquired 23K miles all on Valvoline Restore and Protect. On the next oil change I'm switching to Valvoline Extended Protection Maxlife High Mileage 5w30. Over the past 14 months, I've been inputting volumes of data from my fuel logs, maintenance logs, tons of questions about oil and filters; some of which were inspired by information I found on these threads, and some OBD-II live data into two AI's ,Gemini and Chat GPT. I couldn't think of a better way to make use of that data. Apparently, my 3.7 Liter PowerTec is a finely tuned machine in the prime of its existence. From Geminie, when I inquired about switching oils after 25K miles it told me,
The "Nitty Gritty" Take: You used the Valvoline Restore and Protect to "reset" the engine's cleanliness. Now, by switching to 5W-30 Extended Protection, you are providing the maximum possible physical protection for the metal surfaces and the best chemical support for the aging seals. This is the "Gold Standard" way to push a 3.7L Jeep toward the 250,000-mile mark.
And here's what I got from ChatGPT using one of the OBD-II files I imported.
I'm no mechanic and without the help of the computer and AI I couldn't make sense of the numbers. If it helps me keep the paid-for vehicle running, then hell, let AI take over the world.
The "Nitty Gritty" Take: You used the Valvoline Restore and Protect to "reset" the engine's cleanliness. Now, by switching to 5W-30 Extended Protection, you are providing the maximum possible physical protection for the metal surfaces and the best chemical support for the aging seals. This is the "Gold Standard" way to push a 3.7L Jeep toward the 250,000-mile mark.
And here's what I got from ChatGPT using one of the OBD-II files I imported.
| System | Result | Interpretation |
|---|---|---|
| Fuel trims | ~-4% combined | Slight rich bias (normal, controlled) |
| STFT behavior | Tight, stable | Balanced injectors, clean combustion |
| O2 sensors | Full-range, fast switching | Sensors healthy, responsive |
| MAP @ 65 mph | ~64–65 kPa | Slightly better-than-average breathing |
| Volumetric Efficiency | ~82% | High for this engine |
| Cruise power | ~52 hp (crank) | Matches expected road load |
| Catalyst temps | ~740–755°F | Ideal operating range |
| Bank balance | ~13°F delta | Excellent symmetry |
| Downstream O2 | Stable (~0.63V) | Strong catalyst oxygen storage |
Bottom Line
Your 3.7L PowerTech is: Mechanically healthy, well-balanced, and operating with above-average efficiency for its design.I'm no mechanic and without the help of the computer and AI I couldn't make sense of the numbers. If it helps me keep the paid-for vehicle running, then hell, let AI take over the world.
