My engine is knocking

[Rafael]

Per GM 87 octane fuel is recommended. I've been using that for almost 2 years and now I'm getting knocking. Anybody have any ideas why it's knocking now? Doesn't matter which brand of fuel, but I use Mobil almost allways.

 

[quikag]

Modern engines shouldn't knock. They have enough electronic engine controls to back off timing and adjust fuel maps to prevent knocking. I'd take it to the dealership.

 

[Nnaboy]

Go to the dealership!
May need an oil change, or just more oil!

 

[bad63lac]

Where do you live? Is it high altitude?

Have you tried 89 in it to see if the knock stops?