"Normal" depends on too many factors. People who live in cities will replace brakes more often than those who live in the country. Same for those who drive aggressively vs those who drive more moderately. In other words, there is no "normal".
Wet cell = lead/acid vs lead/acid gel cell vs AGM (absorbed gas mat such as Optima). And that's not getting into EV's that have nickle metal hydride and lithium batteries.
Perhaps in hot climes or frigid ones. I typically see at least 7 years for a battery. My daughter's Cavalier was 19 years old when I got rid of it. In those 19 years, it had 2 batteries, the original Delco that lasted 9 years, and the Delco I replaced it with which was still going when the car left.
You just nailed it, and remember some times, ya gotta fight "fire with fire" Ya just done good
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YES - I do my own oil changes and maintenance and there are several major reasons.
First of all, the oil I use on my vehicles is way way better than any Dealer uses. They take the lowest bidder interested in producing oil for them. Their filters only meet minimum standards and not only do they filter poorly, they often clog too soon and then the bypass valve opens which in turn lets the oil just flow through unfiltered. NOPE - I will use my own oil and filter and will get the best available which I currently consider to be Amsoil.
Secondly, I do not trust car Dealers! I have been disappointed in Dealer service too many times.
Thirdly, what they charge for simple routine and minor problem service is in my opinion ridiculous! While I am still healthy and in descent shape I will as much as I am capable of.
Last but not least, (some might not get this) I actually enjoy doing this kind of stuff!
Sounds bout right but don't have to worry bout 'quick lube' place forgetting to lube filter seal, not tightening oil pan bolt. Next morning notice oil leak under truck. From filter so tighten & get cat litter to soak up puddle. Closing hood smash thumb. Coupla days later your on way to work & notice dash oil gauge dropped to zero. Pull over in 80mph traffic to check. On knees looking under & the dang pan bolt's gone. Won't restart. Call triple A. Truck towed to dealer to check out. Call wife to pick you up. She has a flat on way. Calls triple A to fix. Takes'um hour to get there. They find spare flat & have to fix. After another hour wife's back on road to pick you up at dealer. She...is not happy! Stop on way home for case of beer. Pull in to convenience store. While you're inside car next spot backs out, sideswipes wife's car, stops momentarily & speeds off. You come out to hear wife screaming. Not knowing why you drop case of beer running to her aid & break two toes & also most long neck beer bottles. Need i go on? Ok...dealership calls as your limping in house. Seems when oil pan bolt the quick lube guy didn't tighten fell out, all oil drained out on highway, valves seized & motor locked up. Dealer gives you estimate for new or rebuilt engine. Your bride hears you cussing the phone, runs to see what happened, slips on throw rug & breaks her hip. More? Naw, we're way over $$$$$ to do it your self plus wifes in hospital. Meanwhile the quick lube guy is off work laid back drinking a cool one. Think i'll just keep doin' my own.
I guess I'm lucky, because I used to get 7 years, but last two units lasted just 5 years. Is that quality slipping or just part of the statistical life spread, or is it that there is a lot more electrical stuff on later cars? I don't know. However, here in middle Virginia, we don't get long periods of extreme cold or extreme heat, and I use a battery minder if the car is going to sit more than a couple days.
