10W60 zz4 engine
Thread Starter
7th Gear
Joined: Sep 2024
Posts: 7
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10W60 zz4 engine
Hi,
I have a Corvette c3 1980 with a ZZ4 Crate engine.
i have looked around the internet, and saw that the engine runs good on 5w30 and 10w30.
but inside the car, there is a slip of paper from po and his workshop.
on this paper, the workshop have written 10W60 racing.
so i was just wondering, should i stay with 10W60 or go for 10W30?
I live in Denmark, so it can get cold, but its shut off the entire winter.
I have a Corvette c3 1980 with a ZZ4 Crate engine.
i have looked around the internet, and saw that the engine runs good on 5w30 and 10w30.
but inside the car, there is a slip of paper from po and his workshop.
on this paper, the workshop have written 10W60 racing.
so i was just wondering, should i stay with 10W60 or go for 10W30?
I live in Denmark, so it can get cold, but its shut off the entire winter.
Race Director
Joined: Oct 2000
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From: Shamong, NJ
Below is a link to the Chevrolet specification sheet for the ZZ4. If you look at page 6 you will see that Chevrolet recommends 10W30 synthetic oil, after engine break in.
https://www.chevrolet.com/content/da...e-24502609.pdf
https://www.chevrolet.com/content/da...e-24502609.pdf
Safety Car
Joined: Sep 2005
Posts: 4,228
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From: Orange County Ca
The vast majority of engine wear occurs at start up when the oil is cold and thick.
What is cold?
Denmark cold may be construed differently than southern California cold.
I think the benchmark is about 40-50 deg. fahrenheit. 10w/30 above and thinner below, maybe 5w/20 below.
60 weight is way too thick for normal driving.
What is cold?
Denmark cold may be construed differently than southern California cold.
I think the benchmark is about 40-50 deg. fahrenheit. 10w/30 above and thinner below, maybe 5w/20 below.
60 weight is way too thick for normal driving.
Is my vette stock?? HAHA
Joined: Oct 2015
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
10w50 or 20w50 will have a significant amount of ZDDP for a flat tappet engine. If you run just any oil in a flat tappet engine you will have a greater chance of flattening the cam lobes and dishing the lifters. If you didnt build it, go with what the last owner said to use, there is probably a reason
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,235
Likes: 9,376
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Also the thicker oil will give you a thicker cushion in your main and connecting rod bushings, I run it in my 427 and its 70 psi all day long
Thread Starter
7th Gear
Joined: Sep 2024
Posts: 7
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10w50 or 20w50 will have a significant amount of ZDDP for a flat tappet engine. If you run just any oil in a flat tappet engine you will have a greater chance of flattening the cam lobes and dishing the lifters. If you didnt build it, go with what the last owner said to use, there is probably a reason
I did not build the engine, but i do believe, that a ZZ4 engine is a hydralic roller cam, so no Zinc is needed.
The last owner did not know much about the engine, he had a local mechanic that he used.
I work as a salesman at Toyota, and my mech, says a should just put the recommended on (10w30)
because 10w60 would be too thick for my type of driving (not racing or anything wild)
Thread Starter
7th Gear
Joined: Sep 2024
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50 on a very cold day in the summer, and about 75 on a hot day.
we do have a couple of days where we get a little over 86. but thats not a lot during a full year
from 15 of October until the 15 of march, the car is in a garage, where humidity is controlled but its not heated
we do have a couple of days where we get a little over 86. but thats not a lot during a full year
from 15 of October until the 15 of march, the car is in a garage, where humidity is controlled but its not heated
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I did not build the engine, but i do believe, that a ZZ4 engine is a hydralic roller cam, so no Zinc is needed.
The last owner did not know much about the engine, he had a local mechanic that he used.
I work as a salesman at Toyota, and my mech, says a should just put the recommended on (10w30)
because 10w60 would be too thick for my type of driving (not racing or anything wild)
The last owner did not know much about the engine, he had a local mechanic that he used.
I work as a salesman at Toyota, and my mech, says a should just put the recommended on (10w30)
because 10w60 would be too thick for my type of driving (not racing or anything wild)
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,235
Likes: 9,376
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Probably the fact he has 21 posts and he's from CA....must be a Facebook blow in