Motor Vehicle Maintenance & Repair Stack Exchange Community Digest

Top new questions this week:

Ioniq 6 "Oil Fortifier"

I have a new-ish 2025 Hyundai Ioniq 6 coming up on its 7500 mile maintenance cycle.The dealership is trying to include something called a "BG oil fortifier" in the maintenance package. ...

hyundaioil-changeelectric-vehicleioniq

asked byAnonymous Score of 6 answered byPᴀᴜʟsᴛᴇʀ2 Score of 9

Hyundai Sonata 2007 replacing low beam bulb parts stuck in connector

I was trying to replace the burned-out low bean bulb with a new one on my 2007 Hyundai Sonata LE. I’ve replaced the headlights before (the cars been with me for 18 years) with no issues but this time ...

hyundaiheadlightsonata

asked bypunsoca Score of 4 answered byF Dryer Score of 3

Can an aspect ratio of of +5 % have an adverse effect on a differential?

I replaced a set of 255-65 R17 tires with a set of 265-70 R 17. Could this have any effect on the differential on a midsize rwd pickup? The circumference difference of the tire is +124mm.

tiresrear-differential

asked byRandy Robertson Score of 2 answered byPᴀᴜʟsᴛᴇʀ2 Score of 2

2017 Kia Niro Hybrid — A/C blower died after running at full blast, and ADAS shows “System Off”

I have a 2017 Kia Niro Hybrid, and two problems appeared at the same time:1. A/C blower issueThe blower went to maximum speed.After turning the A/C off and on again, the blower stopped working ...

ackiahybridniroactive-lane-assist

asked bygiraffe86 Score of 1

Greatest hits from previous weeks:

Running with straight water as coolant in the summer. Is it fine?

I grew up flushing the coolant twice yearly. In the Spring, you drain the antifreeze and fill with straight water for the summer. In the Fall, you drain the water and put in a 50/50 antifreeze/water ...

coolantcooling-system

asked byWulfhart Score of 34 answered byBob Cross Score of 40

Bubbling sound from the cooliant area when I turn the engine off

I drive a 2002- Chrysler PT Cruiser. I hear this bubbling sound when I turn the engine off. It occasionally registers at hot so I put more coolant in and it seems OK for a while. The coolant is not on ...

chryslerpt-cruiser

asked bySylvia Score of 3 answered bydobey Score of 2

Is idling bad for your engine?

If I sit in my car for 30-40 minutes with the AC and the car idling, does that "hurt" the engine, or does it simply waste gas and pollute the air? Would it be better if I turned off the car? A ...

enginefuel-consumption

asked byRHPT Score of 25 answered byJessie Score of 12

How long will gas stay fresh in a five gallon plastic container

How long will a 5 gallon plastic containers of fuel stay fresh?

gasoline

asked byrobert hodge Score of 9 answered byPeteCon Score of 4

Can I reprogram a used Mercedes smart key?

I want a new key for my Mercedes Benz and I've heard that you can get a used smart key for much cheaper than a new one from a licensed Mercedes mechanic.Can I reuse an already programmed Mercedes ...

mercedes-benzkey

asked byZelda Score of 8 answered byZelda Score of 5

What actually happens when there is way too much oil in a car engine?

I saw the answers to a question I posted recently highlighting the disadvantages of having too little oil in an engine, but that got me wondering what if the complete opposite were to occur!I know ...

engineoiloil-changeengine-theoryservice

asked byMax Goodridge Score of 26 answered byEdward Score of 18

What does this symbol on my dash mean? GMC W4500

The light can be switched on or off by operation of the stem on the right of the steering wheel, the same control that operates the windshield wipers.I can't detect any difference whether it is on ...

truckgmcdashboard

asked bydjsunkid Score of 6