if the car is running rough or if plugs are in poor condition
when should the timing belt be changed on a 2007 Nissan sentra
when there isn't enough spark going to the sparkplugs, and your car is not starting. sometimes it occurs most in winter because of the temp.
Sparkplugs are almost universal, because of the way sparkplugs work and the way they are shaped the same, it means you should be able to use "standard" sparkplugs.
You must buy BOSCH sparkplugs for this vehicle.
what type of oil should i change for Nissan sentra 2006 Normally 10W30 or 10W40 is good thicker for older cars 10W40 is thicker FYI
every 20-25000 miles
You should be able to reach around without unbolting motor mounts.
when the oil on the dipstick changes color from a clearish golden brown to brown or black then you need to change your oi.
Sparkplugs should be changed at regular intervals, it will usually state how often in the service manual and most garages will do it during a service regardless. It is no harm and often a good idea to check the sparkplugs yourself as the condition of the sparkplus can hint at other problems in an engine. See the following website for more details http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp Depending on the engine it can be a relatively straightforward task or an agonizing ordeal.
I checked mine at 45,000 miles, and they looked brand new! Then I checked the owner's manual (should have done that first), and it shows a service interval of 100,000 miles.
Open the hood and unscrew the knob behind the headlamp. There's a rubber covering, metal clip, and plug you need to get past before you get to the lamp. Once you're there it should be easy to pop it right out.
Check all vacuum lines