Can I use 85 grade gas if my car manual says to use 87 grade?

Question:
Or will it make my car break?

Answers:

Why do I feel like my car runs better after I have it washed?

it is not recommended to use lower octane rating than the one specified by the Mfg. 85 octane burns hotter. this could cause your combustion chamber to get hotter than normal resulting in slightly overheating engine.

My ford F-250 will stall on me while driving why and how to fix it?

LOL - yes you can ... if it starts to "knock" switch back although it's highly unlikely ...

I have a tuning file for an audi a6 but mines a quattro. does it make a difference?

sounds like you're in a high altitude region like colorado or utah? you should be okay if that's the case, but if you are closer to sea level then no, you dont want to do that..

Does anyone know how to stop my car from getting broken into?

It won't make your car break, but your engine will not run as smoothly.

How do I wire foglamps?

better not. you can use higher octane rated gas but going below the safer limit is not advisable for the engine.

How long should windsheild wipers last, the rubber is falling apart after 45000 miles on my chevy? other cars?


higher the octane, the better.

Does head gasket repair fluid really work?

How new is your car? If you don't use at least 87 grade then it might void your warranty.

What should the timing be on a chevy 383 motor?

use fuel additives if u would be using 85 octane.lower octane fuel can damage the valves.usually thre will be carbon deposit on valves;in extreme cases the valves get bent.
also there would be some knocking in the engine.so always use additives.

Engine cranks slowly once or twice before starting?

you will ok, unless, you hear a pinging sound. then switch up to a higher grade or use octane booster.
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