Hi Scotty and everyone,
I just got a 1993 Chevrolet Camaro z28. I'm curious what kind of fuel should I put into it?
I've googled, some recommend just 89, some insists not to put in 91 because of its high octane level.
I'm concerned as this is an older car and I'm not familiar with these older engines.
What do you guys think?
Thanks in advance!
Edward
5.7L LT1 (Code P)
Use premium unleaded gasoline rated at
91 octane or higher. You may use middle
grade or regular unleaded gasolines, but
your vehicle may not accelerate as well.
Be sure the posted octane for premium is
at least 91 (at least 89 for middle grade
and 87 for regular). If the octane is less
than 87, you may get a heavy knocking
noise when you drive. If it’s bad enough,
it can damage your engine.
https://www.wc-autoparts.com/content/camaro_owner_manuals/1993camaro.pdf
I've had several camaro's and trans-ams with the same engine. I've always just used regular and never had any issues with knocking, but then I never rag on my cars. If you're going to drive very spirited, then you may need to go up in octane if you experience any knock.
use what it says on the the gas filler door or in the owner's manual
Regular is fine for those old LT1's. Premium will run a tad better, but unless you are getting knock just run regular.
If the engine and fuel system is original, I think it would be a good idea to use non ethanol fuel given the model year. The rubber components and seals in the fuel chain might not handle the ethanol well unless vulnerable parts have been replaced or upgraded.
