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What oil should I use? Rate Topic: -----

#1 User is offline   Cody Andrews 

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Posted 02 July 2012 - 04:39 PM

I know the owner's manual says 5W-30, but my mechanic says that I should run 10W-30 in it now that summer time is coming up as well as the 85,000 miles on my vehicle. He said the thicker oil will help prevent oil leaks. I only use synthetic oil, by the way. Is my mechanic correct or should I run 5W-30 like the manual says?
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#2 User is offline   Pete W 

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Posted 02 July 2012 - 08:47 PM

I would get a new mechanic and stay with 5W30.
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#3 User is offline   djfirebird93 

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Posted 02 July 2012 - 09:42 PM

^^^ Agreed. If your manual calls for 5w30, that's what you should put in there. True, in the fact that thicker oil is recommended for warmer temperatures, and thinner for colder temperatures, but what your manual says is what's best for your engine. The manufacturer would now what's best for the engine that they made. Just my opinion.
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#4 User is offline   Injuneer 

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Posted 03 July 2012 - 02:30 AM

The fact is, when fully warmed up, a 5W-30 oil has the exact same viscosity (within the defined SAE range tolerance) as the 10W-30 oil. The first number tells you how thick or thin the oil is on cold start. The second number tells you how thick or thin the oil is when at full operating temperature. The "30" makes them both the same. The 5W offers you the advantage of better oil circulation at cold startup, when the ambient temperatures are below 0*F.

The fact that the engine has 85,000 miles on it doesn't mean much. If properly cared for, the internals should still be in excellent shape. There are LT1's that have exceeded 200,000 miles.
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381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor
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#5 User is offline   GaryDoug 

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Posted 03 July 2012 - 05:30 AM

View PostInjuneer, on 03 July 2012 - 02:30 AM, said:

... The 5W offers you the advantage of better oil circulation at cold startup, when the ambient temperatures are below 0*F...


The fact that he lives in Florida may impact that slightly ;-)
WTF is 0* again? (rhetorical?)
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#6 User is offline   Injuneer 

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Posted 03 July 2012 - 01:47 PM

I used 10W-30 in my LT1 in all weather except in the winter with the stock block. Winter was 5W-30. That is exactly what the Owner's Manual indicates is acceptable. Even with the stroker and the required 25W-50 for nitrous use, the shop recommended that I use 5W-30 in the winter.... and no nitrous :(

I can't think of too many times when it's actually dropped below 0*F in NJ.
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381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor
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