4.9 Owner Requesting Help
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Sounds like your lifters are chattering. When was the last time you changed the oil? Is the climate pretty cold where you live? May it is time to change oil viscosity. The lifters may also have sludge build up in them, if they are original, since oils from yesterday were not as advanced as today's oils. Older types of oil can and used to cause sludge and build up inside your engine, causing problems like you are describing.
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If I told you it's okay to run an engine with an audible metal-on-metal noise, I'd be lying to you. It's not a good thing. But if you're already running thin oil and you're using a new filter and it's still chattering, there's not much else you can do unless you want to open up the motor. Maybe try a bottle of Lucas or STP.
I think you're getting a "placebo effect" with the premium gas. High octane fuel means it can be compressed farther before detonating than lower octane fuel. If you are running a stock engine and it doesn't have detonation problems, then upping the octane is wasted money because the added potential does not get used. If you actually put your truck on a dyno machine with 87 and 93 octane fuel, you would see very little or no difference at all. I'm saying that it's a common misconception that premium fuel makes you go faster. If you are under this misconception and you spend a lot of extra money to fill up with it, it's natural for the truck to "feel" faster. I assure you though it's not.
Anyone who wants to dispute my claim should show me documented facts and dyno charts comparing a stock engine vs. octane rating. Until someone can do that, "race gas" remains a misconception. And for people's future reference, "my grandpa always ran it that way, so you're wrong" does not count as scientific evidence.
I think you're getting a "placebo effect" with the premium gas. High octane fuel means it can be compressed farther before detonating than lower octane fuel. If you are running a stock engine and it doesn't have detonation problems, then upping the octane is wasted money because the added potential does not get used. If you actually put your truck on a dyno machine with 87 and 93 octane fuel, you would see very little or no difference at all. I'm saying that it's a common misconception that premium fuel makes you go faster. If you are under this misconception and you spend a lot of extra money to fill up with it, it's natural for the truck to "feel" faster. I assure you though it's not.
Anyone who wants to dispute my claim should show me documented facts and dyno charts comparing a stock engine vs. octane rating. Until someone can do that, "race gas" remains a misconception. And for people's future reference, "my grandpa always ran it that way, so you're wrong" does not count as scientific evidence.
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