what kind of oil 402
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TECH Apprentice
Joined: Aug 2009
Posts: 389
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From: NB Canada
what kind of oil 402 Had a 402 built,they said that they build them on the loose side, shop told me that my ls1 oil pump ported and shimed would be fine. what grade of oil should i run. 10w40, 20w50 or ???, what brand do you's use. i was using 5w30 mobile synth. i only run the car in summer.
I have been running Rotella T 15w40 in my 416 since day one with no issues at all. Now at 4k miles I'm thinking of going with a synthetic, not sure which one yet. All of the good quality diesel engine oils have a high ZDDP content which is very good for engine break-in. Alot of hi-po engine builders recommend this oil for break-in.
Jimbo
Jimbo
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Launching!
Joined: Jun 2009
Posts: 268
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The 15-40 oils do not have zync in it any more. The epa pulled their crap and with the 07 enission standards on new trucks you cant have zync oils. The cat wont tollerate it. But not to worry 15-40 is fine because our engines have roller cams. Basically zync is meant for high friction areas like cam to lifter contact on flat tappet cams. You can buy EOS supplament from your chevy store or buy ZDDP on line. Never run a 10-40 oil in anything. Rule of thumb is the broader the numbers the less oil the oil has. example 10-30 is a higher oil content to chemical viscosity modifiers. 10-40 has more chemical modifiers then oil. We do run synthetics but got away from it because of the wild cams and profiles we run.
The 15-40 oils do not have zync in it any more. The epa pulled their crap and with the 07 enission standards on new trucks you cant have zync oils. The cat wont tollerate it. But not to worry 15-40 is fine because our engines have roller cams. Basically zync is meant for high friction areas like cam to lifter contact on flat tappet cams. You can buy EOS supplament from your chevy store or buy ZDDP on line. Never run a 10-40 oil in anything. Rule of thumb is the broader the numbers the less oil the oil has. example 10-30 is a higher oil content to chemical viscosity modifiers. 10-40 has more chemical modifiers then oil. We do run synthetics but got away from it because of the wild cams and profiles we run.
i ran 10w-40 royal purple in only 2 motors both went through rod bearings with in 5 months i hate royal purple and will never use it, i had both motors for 3 years same setup as soon as i use royal purple they had problems and thats the only time ive had problems, that oil is junk and a waste ive heard countless bad things about royal purple have gone thru 2 motors thanx to royal purple, i use ams oil , full synth race oil and never had a problem.
Last edited by JimSwan; Dec 12, 2009 at 04:43 AM.
Launching!
Joined: Jun 2009
Posts: 268
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Never run 10-40?? Are you crazy?? You got to come with something different than that for a excuse for not running 10-40. I've ran 10-40 royal purple for the last 6 years with no problems. There is not to much difference between 10-30 and 10-40 anyways. Not enough to make a statement about.
.
I was told you shouldn't be switching back and forth from heavier to thin motor oil. I was told it was very bad for the piston ring wear.
i ran 10w-40 royal purple in only 2 motors both went through rod bearings with in 5 months i hate royal purple and will never use it, i had both motors for 3 years same setup as soon as i use royal purple they had problems and thats the only time ive had problems, that oil is junk and a waste ive heard countless bad things about royal purple have gone thru 2 motors thanx to royal purple, i use ams oil , full synth race oil and never had a problem.
Launching!
Joined: Jun 2009
Posts: 268
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There seems to be a lot of mistery about oils. First the W rating on any oil represents a winter oil. An SAE rating is a summer oil and is recommended for temps higher than 45* The service manual explains that. Most engines manuals will not recommend W oils in higher temps with sustained speeds. Changing viscosity will not hurt your engine. But running a multi vis oil in high ambient temps at sustained speeds is a NO NO. For a 4 cylinder grocery getter is fine. But not on a high output engine with high HP. Just my $.02
TECH Regular
Joined: Sep 2008
Posts: 425
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From: Scottsdale, Arizona
I find it strange to run multi viscosity oils for break in. I have always used straight weight oil for break in 30w. Once you get some time on the engine, do a leakdown on all of the cylinders to make sure everything has been seated in.
Only after everything looks good on the gages, that is when I switch over to synthetic.
Just my .02¢
Only after everything looks good on the gages, that is when I switch over to synthetic.
Just my .02¢