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1993-97 Gen II Small Block V8

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Old 06-02-2007, 01:03 PM   #1
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Default What weight oil to use in 97 camaro z28?

I just changed my oil for the 1st time other week and used Mobil 1 synthetic 10w-30 but read in owners manual that 5w-30 was actually supposed to be better..wanted to know if there was really any major difference and also what brand oil is the best to use?
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Old 06-02-2007, 02:21 PM   #2
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It says 5w-30 because of C.A.F.E. Corporate Average Fuel Economy, has nothing to do with what is right. They wanted milage and enough protection to get past warranty with normal use.
That said some 5w-30s might be quite good, M1 5w-30 and 10w-30 whaen actually measured DO NOT perform well in this motor, the much thicker 0w-30 Castrol Suntec labled "made in Germany" performs great easily argued the best available oil for a stockish LT1.

If you are partial to M1 just try the 0w-40 or 5w-40 is you run across it.
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Old 06-02-2007, 02:23 PM   #3
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good luck with the GC 0W30 HAHAHA.
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Old 06-02-2007, 02:56 PM   #4
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I use the M1 0w40, most stores have it.
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Old 06-02-2007, 04:12 PM   #5
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What is a good oil for a modded LT1 like mine?? Ive been using 10w30 M1
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Old 06-02-2007, 04:32 PM   #6
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Quote:
Originally Posted by cookba
good luck with the GC 0W30 HAHAHA.

what do u mean good luck? It's a great oil, far superior IMO then 10w30 and 5w30 m1 blends. Maybe you mean good luck finding it.
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Old 06-02-2007, 05:56 PM   #7
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why is 0w-30 Castrol Suntec or M1 0w-40 so much better? you meant synthetic w/ both these too right?
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Old 06-02-2007, 06:11 PM   #8
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Used oil analysis for Mobil 1 5w-30 and 10w-30 have historically shown them to be mediocre in this engine at best. Iron wear in particular is high. It is quality oil just those two are not well suited to this engine based on the measured results of wear metal in oil. Based on that same testing the Castrol Syntec does much better, part of that may be because it is thicker. -30 is a weight RANGE not a specific viscosity. M1 tends to be on the thin side of the range and the LT1 and even LS1 have shown a preference for thick 30wt and thin 40wt. oils There is a lot more going on than just viscosity but it is still a recognizable trend.
the 5w, 10w numbers are not comparable to the second number and do not affect the viscosity, most 0w-30 oils are actually thicker than either M1 5w-30 or 10w-30.
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Old 06-02-2007, 07:39 PM   #9
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buffman, ya i meant good luck finding it. AHAHAHA
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Old 06-02-2007, 10:47 PM   #10
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Come on I have 45 quarts of it Just gotta look. it is on sale again this month. 4.49 a quart. Nothing wrong with other syntec grades such as 5w40
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Old 06-02-2007, 10:55 PM   #11
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^^your the reason no one can find the stuff. HAHAHA. when i get to FL next weekend i am looking for it for my oil change. YAY for cross country trips.
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Old 06-02-2007, 10:57 PM   #12
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It seems certain regions are having it on sellthrough yet some other regions have fresh 07 date code CG. My store doesn't have it on sellthrough, but it hasn't restocked with fresh yet. I've had them pull inventories of other sister stores, and then had them bring it in
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Old 06-02-2007, 10:59 PM   #13
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i guess your special like that.
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Old 06-02-2007, 11:19 PM   #14
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I used Royal Purple 5W-30... is it worth the $7+?
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Old 06-02-2007, 11:34 PM   #15
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^^ Not for $7 a quart. It's a decent oil, but for $7 /qt no.
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Old 06-02-2007, 11:34 PM
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