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1997 Nissan Sentra GXE, 201K miles, 1.6 liter

Tiny
BTHELLAM
  • MEMBER
  • 1997 NISSAN SENTRA
I got the oil changed in my GXE last month. Before the change, it was averaging almost 350 miles per tank (30-31 mpg). I believe the car had been using 5W-30 before this change, but I was given a bunch of liters of All-Climate 10W-30 by a friend and decided to have the mechanic use it up for this oil change. In the last month (October) I've had a noticable drop in gas mileage, barely making it over 300 miles before refilling. Would 10W-30 actually cause this sudden decline in gas mileage? (I haven't looked at the spark plugs or air filter yet, and it doesn't seem cold enough yet to be the change of season.) Thanks much guys!
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Saturday, November 3rd, 2007 AT 1:08 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
When was the last major tune-up? Could be due
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Saturday, November 3rd, 2007 AT 4:33 AM
Tiny
BTHELLAM
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When the mechanic changes the oil, he does a tune-up as part of the labor. I'll have to ask how much he actually does, but he's always been very good about checking everything over and letting me know if the Sentra needs or will need any particular work soon.
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Saturday, November 3rd, 2007 AT 8:50 AM
Tiny
RASMATAZ
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When the mechanic changes the oil, he does a tune-up as part of the labor.

What kind of tune-up does he do as part of labor?

Fuel consumption can be anything from Brakes/Suspension/Engine/Ignition/Fuel/Transmission-it needs to be throughly check to identify the problem area.
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Saturday, November 3rd, 2007 AT 2:22 PM

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