Do oil and fuel additives really help your car run better?
Yes, the definitely do. That's why good quality fuel and oil manufactures and refineries add them to their formulas - there's really no need for you to add any additional additives.
What may be wrong is the BCM (body control module) and if the vehicle has less than 36,000 miles then it will be covered under the GM warranty
Regular oil changes protect your engine and help it maintain peak operation. Most fuel additives only boost octane, which isn't always beneficial. In most cases, fuel additives are a waste of money.
i would say they MAY. in my 200 sx (basically a '96 sentra 4 cyl, 5 sp) i drove 300 miles in usa then added SOME gas additive in monterrey mexico and filled up on pemex. i would drive to 275 at the half-tank mark, (which i am acutely in tune with-as today, i hit 255 miles at the 1/2 and will get 502 miles and need 12.5 gals if i continue my work route) in usa it is difficult to hit 250 with highway driving at 70. last 3 years i drive 50-55 to get 40-44. on my return trip i used bardahl from mexico and in usa, on exxon gas, STILL COULD NOT get much past 250 at the 1/2. was it pemex or was it the additive?!? i used super nova and exxon supreme all the time. it is the mexican gas formula or the additive. next trip, i wil eliminate the additives and see! as far as oil additives, i don't think they are necessary. i am using a sm grade 10w40 in texas, castrol. any modern oil is sm, weight depends on your climate, but in russia i use 5w 40 half-synthetic lukoil. in texas, many swear by straight 30 weight, but not me. the additives are already in the oil and adding more is not necessary.
