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#1 |
Join Date: Sep 2004
Location: SELDEN, NEW YORK
Posts: 26
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With the issue of taking zinc out of the new formulted oils, I need to know if anyone has the definitive answer for using an oil with the best protection for our beloved LT-5 that will provide the necessary protection that the old oils used to. I don't want to use a zinc additive because it has been reported that it destroys the catalytic converters.
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#2 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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I'm using the Castrol GTX 15W-40 Diesel. It has the levels of zinc etc that everyone's been talking about here at $4/qt. No additives necessary.
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#3 |
Join Date: Apr 2006
Location: Ideho
Posts: 2,653
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I think I'm going to try the Valvoline VR1 10-30 next time around. High zinc and phospherous and Marc H. said it would be a good oil. Hard to get though, not readily available at the common stores, although 60w, 50w and 20-50 weight is. Weird.
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[I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I] |
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#4 |
![]() Join Date: May 2008
Location: USA
Posts: 1,096
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Use high mileage mobil 10W-30.
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#5 |
Join Date: Apr 2010
Location: O'Fallon, Mo
Posts: 738
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I use amsoil
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#6 |
![]() Join Date: Jan 2004
Location: Vancouver Washington
Posts: 238
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#7 |
![]() Join Date: Jan 2009
Location: Gettysburg, PA
Posts: 247
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Amsoil has a high zinc 10w40 that alot of us use. I'm sure your local performance shop can order it for you.
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90 ZR-1 #0951 Bright Red (sold) 06 Z51 MN6 Velocity Yellow (sold) 2023 C-8 Z51 ELB WAZOO Member |
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#8 |
Join Date: Apr 2006
Location: Ideho
Posts: 2,653
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I'm switching to the Valvoline VR1 racing oil, 10-30, for the next oil change. Real high in zinc and phosphorus and Marc Haibeck said it would work well for our motors.
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[I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I] |
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#9 | |
![]() Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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![]() Quote:
I did some reading over at the oil guy's site. Jim from FLA posted a link awhile back and I read the whole thing front to back. I think I'm going back to 10w-30 full synthetic. ![]() Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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#10 |
![]() Join Date: May 2008
Location: USA
Posts: 1,096
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I can't find that technical document I posted but its around somewhere.
The jist of the article was that Mobil 1 High Mileage was fine for the LT-5 engine. There are disadvantages to adding zinc if not done properly. I'm sure Valvoline and the others are good if you can find the 10W-30. I go with what has worked for me. I have had several engines well over 100,000 that ran like a raped ape and they were clean as a whistle. Mobil 1 works for me. I buy it often for $19.99 to $25.00 for 5 quarts. I buy a ton of it for the 3 Corvettes and Mobil 1 has a rewards program. I change my oil seasonal regardless of mileage. Many times I change it prematurely at 3,000 miles. If I get busy, then higher mileage. On my Z - its really spoiled. Often times, it only has a few hundred miles on the oil. It gets seasonal changes, especially after the winter storage if I'm in a cold state. My oil cooler oil stays in good shape as a result. It is way overkill but my oil changes are dirt cheap since I always get the oil on sale and do it myself. If memory serves me right, regular mobil 1 is good for 6 months and extended mobil is good for 1 year. (as long as within mileage limitations) I also do my coolant now at 1 year intervals. Last edited by xlr8nflorida; 03-01-2011 at 06:17 PM. |
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