Q: You may be getting a lot of responses on this one. Subaru Legacys and Outbacks are prone to water freezing on the inside edge of the fuel fill door. It is more common on the Legacy. The solution is to insert a credit card in the space around the door and work it around the opening. Once free, the door opens normally.

— T.B., Chicago

Q: I once had the same stuck fuel door problem. What I do now is wax the inside of the fuel door, especially the latch. Have not had a problem since.

— R.W., Chicago.

Q: I have a 2013 Legacy and had a similar situation where the gas door didn’t open. Subaru said I was required to change the whole gas cover door assembly for a couple hundred dollars. I looked at the door and found it was only a missing rubber bumper that pushed the door out. I found one at Ace that cost about 79 cents. I bought a couple and keep them in the glove box. I think they get pulled out when the gas hose hits them. I keep finding them now when filling with gas and looking at the ground.

— J.G., Chicago

A: It looks like we opened a can of worms. I am now closing the door on this subject and am happy to share your tips. Thanks.

Q: A friend carries a battery device in the trunk of his car. It can be used to jump start a car in the event of battery failure. Your opinion on these devices? Any brand that you would recommend?

— T.C., Park Ridge, Ill.

A: They do work well enough, but are mostly limited to smaller, four-cylinder engines. They don’t pack enough oomph to start anything larger. Some double as a battery bank for smart phones and other electronics. There are many similar compact lithium-ion battery packs out there and I can’t suggest a brand.

Q: Recently I filled a container with about two gallons of gasoline for my snowblower. I wondered how much premium, 93 octane gas, I was getting if the person who previously used the pump bought 87 octane. Those gas pump hoses are quite long, and it seems they could hold at least a gallon of gasoline, but maybe they have a system in place to purge them between uses. Did I get a mixture of octanes, or did I get what I paid for?

— B.T., Wheaton, Ill.

A: The amount of fuel lurking in the dispenser can vary, but I use one quart as a rule of thumb. That’s why I wait until my motorcycle is nearly empty before filling it with the required premium gas. The system for purging is the next customer bellies up to the bar.

Q: I have a 2017 Honda CRV, which I like except for the entertainment system. It won’t accept and play CDs. I have many, mostly educational. Do you know of any new similar vehicles of other makes that still accept CDs? I am starting to look for a new one.

— J.S., Chicago

A: You will have a hard time finding many 2021 cars with CD players. Even many laptop computers no longer come with an optical drive. The last holdouts were Lexus and some GM trucks and SUVs. But don’t take it as gospel. Call around to dealers. Your best bet is to copy the CDs to your smart phone or flash drive or have a service copy them for you.

(Bob Weber is a writer and mechanic who became an ASE-certified Master Automobile Technician in 1976. He maintains this status by seeking certification every five years. Weber's work appears in professional trade magazines and other consumer publications. His writing also appears in automotive trade publications, Consumer Guide and Consumers Digest.)