1) Every online car insurance quotes service has sponsors or at least a sponsor. The results they return will be tailored to favor their sponsors. Does this mean they'll give you wrong information? NO! What it means is that they'll likely omit any company that offers a better price-value.
This may be widely denied but I know if you use your commonsense you'll agree that no one will set up or sponsor a car insurance quotes site and then include a competitor that has a better price-value. The normal thing is that they'll add weaker competitors. And, I think it makes sense.
2) Because of the above reason and more, you must be prepared to get quotes from as many of these car insurance quotes sites as are relevant to your location and needs. That way you'll be able to nullify any interests that may not be in your favor.
3) Before you finally settle for an insurance company because of its low price, check what you get for the low price. The lowest price may not really be the best price. The best price is that which offers the greatest value at the most cost-effective price.
If you take these three tips to heart and make use of them while getting your car insurance quotes, you'll make savings that will not compromise you on the long run.