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03-14-2017
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#1 |
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Join Date: Nov 2016
Location: Atlanta GA
Posts: 13
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Oil Usage
My 91 ZR-1 uses about a quart every 1100 miles or so. 62k miles. No leaks or oil smoke I see. Plugs are clean. Any ideas or concerns?
Sent from my iPhone using ZR-1 Net Registry |
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03-14-2017
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#2 |
 
Join Date: Feb 2013
Location: Yakima Washington
Posts: 405
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Re: Oil Usage
Sounds pretty normal for a z. Depends a lot on how often your foot is in it.
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Jim 1990 Z # 2441 1959 c-1 230 HP 4 speed frost blue/silver 3 owner 2011 cts-v 556 HP, manual 6 speed 1955 chev 2dr ht PP 265 3 speed w/OD |
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03-14-2017
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#3 | |
 
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,826
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Re: Oil Usage
Quote:
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03-15-2017
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#4 |
 Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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Re: Oil Usage
Only the 90s, because they had no exhaust valve seals, have a reputation for abnormally high oil use under "normal" conditions.
At 62,000 miles, I'd say that 1100 miles per quart would be just over the high-side "normal" if the engine is using a good 10W30 synthetic and is subjected to a normal duty cycle.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
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03-15-2017
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#5 |
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Join Date: Oct 2016
Location: Atlanta GA
Posts: 51
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Re: Oil Usage
Yes, like most of us foot is mashed much of the time for the fun of it. The car runs 10 W 30 synthetic. At this point of it's life. Should I run 10W-40 or 20 W 50? Thanks for your help!
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03-15-2017
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#6 |
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Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,538
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Re: Oil Usage
It seems like the first quart goes away very quickly. Leave it down a quart, as long as your not road racing, you should be ok. Don't forget, it has 12 quarts in it.
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03-15-2017
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#7 |
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,117
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Re: Oil Usage
My experience is that in normal driving I hardly l used any oil in either my 93 or 95. On my trips down to Bowling Green (about 450 miles each way) I showed no oil consumption for the whole trip if we did not do any actual racing. When we went drag racing or did some hard laps on the NCM track I consumed about half a quart more than without it. So having your foot in it does seem to make a difference
 -Bob
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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03-15-2017
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#8 |
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Join Date: Oct 2016
Location: Atlanta GA
Posts: 51
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Re: Oil Usage
With the LT5 and 61,000 miles, would it be OK to run a 10 W 40 or 20 W 50 oil possibly to reduce the oil consumption? Thanks for everyone's help!👍
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03-15-2017
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#9 |
 
Join Date: Jan 2010
Location: Mystic CT
Posts: 2,632
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Re: Oil Usage
GM said 10w-30, but what do they know?
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03-15-2017
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#10 |
Join Date: Mar 2014
Location: Warrington PA
Posts: 1,914
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Re: Oil Usage
I have been using Mobil 1 10W-40 High Mileage in my 94 and am satisfied with it. The most oil I have added is a 1/2 quart or slightly more and that is usually after long trips and some spirited driving. I also wait 12 to 15 hours before I check the oil. I know everyone has a different way or time they like to check, but I have found that it takes awhile for the oil to fully drain into the pan after the engine has been running. I base that on the readings I get on the dip stick say an hour after running compared to the 12-15 hours waiting period. Your readings or methods may vary.....
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Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1974 L-82 355 Vert. 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
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Linear Mode
