96HealyZ28

Every morning when I start up the car, it will knock for about 10 seconds then go away. I have a 96 Z. Is the oil too thick? Im using 10w-40, or does that mean its time for an oil change? Any ideas, thanks.

scoobysnax83

10 seconds, mine will knock when I rev it for like 5 minutes. Comes with the LT1 territory. Is this a recent problem?

Cold weather brings out the best in the Z28. Lots of weird noises and .3 seconds off your 1/4 mile....

96HealyZ28

Yeah, it is a recent problem, bout a month now. I thought it just me be from the weather getting colder myself, but Im in san francisco, so the weather is not that extreme. I just wanted to make sure it wasnt somethin serious. Thanks

z28s

Start with an oil change, i use 15w50 its around freezing here in the morning, my engine doesn't knock more than a second

scoobysnax83

thats entirely to thick for the winter time.

96HealyZ28

Thanks guys, an oil change it is. We'll see after that.

z28s

scooby
its been working for me for 6 years

scoobysnax83

I'm not questioning weither it has or has not, but that is too thick for near freezing temps.