I bought a red top used off craigslist over 3years ago and it's still great.
A few months ago I replaced the autozone battery with an optima red top. I've left the lights on twice for over half the day and the car still started right up. I'm really impressed with how strong the red top cranks.
I use Red top Optima batteries in all my cars, I truly hate flooded lead acid batteries as they will leak at sometime in their life.
I run a Optima yellow top as well, but mine fits in just like stock.
I have an optima yellow top in mine.
I had an Optima I took out of my Crew Cab Dually, probably two years old (used for my car stereo). It sat in my garage for a year. Then I needed a battery for my 1/2 ton truck. I charged the Optima and installed it. I ran it for three years without problems. Sold the truck with the battery still in it.
Absolutely YES you should buy the optima RED top 6 volt batteries instead of the dealer yellow top batteries. There is virtually NO difference between the RED top optima battery and the dealer yellow top optima battery that the dealer sells. Both are made by optima.
I just threw in a red top in the G60 and it did not fit well at all. The optima website mentioned some sort of adapters that were supposed to fit on the long edges of the battery to make it fit better under the battery holder, but I did not get any with my battery. I ended up shimming it to get it snug.
Every optima battery I have seen in customer vehicles (I'm an auto tech) goes to crap in about 6 months to a year. I think these types of batteries are more sensitive to low voltages. They also don't hold up at all during the freezing winter months.
I had an optima in my garage queen, wasn't even hooked up most of the time(unhooked it till I wanted to drive/work on it). it died 2 years and one month later, with MAYBE 1000 miles on it, no replacement/etc. now it's a doorstop in my garage.
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