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P0615 but my truck starts fine. No warning lights on. Should I even worry about it? Comes back when it is cleared within a few drives. Just so we are all on the same page, this seems to be more about the Park/Neutral signal than the relay itself looking at service data. I am slightly paranoid...

Nissan calls for 80W-90 Conventional GL-5 in the front diff in the Frontier. Any reason why? Can I put 75W-90 GL-5 synthetic in there? I guess I am confused as to why it specifically says "Genuine NISSAN Differential Oil Hypoid Super GL-5 80W-90 ( con- ventional oil) or equivalent" Is this just...

2022 Kawasaki Versys-300 2,499 mile interval, Supertech 10W-40 motorcycle oil. Elevated copper. Not really liking the shear on this oil, currently trying Rotella 15W-40 T6, might change to something else. To clarify it’s Supertech moto oil, JASO and all that. I am curious about the elevated...

8,005 mile oil change, oil was in use around 6 months. I’m fairly gentle on my car but I do live in the mountains and I think I’m having a temperature control issue in the engine where it’s running a bit cold(have another post on that) so I’m happy with these results for sure. Was also looking...

Hello, I have a 2020 Mazda 3 has an issue getting up to operating temp. Both of the coolant sensors agree, the car is running cold. Unless I drive aggressively, in 10-40F temps, it struggles to get above 140-160F when I have the heat on. This is a fairly well known issue, and there’s a TSB for...

Replaced my rear diff fluid due to people having early failures of the diff on this car. Not sure if it was from under filled diffs at the factory or actual mechanical flaws. Anyways fluid looked fine when I changed it. The factory fill should be Mazda 75W-85 SG1 GL-4

My very simple logic here is the 5W-30 is probably the better choice for the engine. If 0W-20 was really what was optimal, why not recommend it globally? Thoughts? Especially when it’s hot.

I live in Utah, and plan to go riding south of me. Temps routinely exceed the 40C/104F which the manual says is the limit for 10W-40 which is the bike's normal recommendation. Both 10W-50 and 20W-50 are listed as options. My gut says 10W-50. It still gets rather cold at high elevation in the...