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#1 |
![]() Join Date: Mar 2022
Location: Houston, TX
Posts: 39
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I just purchased a 1990 ZR1 with 20k miles last weekend and will be picking it up and trailering home in a couple weeks. I'll have a few days to go through everything on it and then have a 600 mile trip planned. The previous owner has had the car for 8 years and only put 2k miles on it. He recently had fluids changed, but I noted he had it completed by a local oil change shop and would feel more comfortable knowing first hand what fluids were in the car. I'm planning the below maintenance based on recommendations browsing through the various ZR1 info sources, is there anything additional I should check or complete?
Oil Change - Driven HR3 10w30 and Wix filter Trans Fluid - Castrol Supercar 10w60 Diff Fluid - Valvoline 75w90 Synthetic + ACDelco limited slip additive Spark Plugs - ACDelco 41-602 gapped to 0.035" Air filter Fuel Filter Replace brake and master cylinder hydraulic fluid (syringe method) Clean PCV and throttle body Check brakes We'll of course do a good 50 mile spirited drive to verify everything seems to be in proper working order prior to setting out for the longer drive. |
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#2 |
![]() Join Date: Apr 2022
Location: NorCal
Posts: 14
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Congrats! I'm doing similar with my recently acquired 90 ZR1 with many more miles LOL, nice list thank you.
I'm not familiar with HR3 oil, but do see this re: ZR1 oil and need for high zinc content because flat tappet motor: (I went with Amsoil AMO 10W-40 for first oil change based on document content) http://www.zr1specialist.com/HAT%20W...5%20Engine.pdf Beyond checking tread depth on tires check for cracking and date code, a lot of concern on running on old tires, many threads. Have fun!!! |
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#3 | |
![]() Join Date: Mar 2022
Location: Houston, TX
Posts: 39
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https://drivenracingoil.com/c-138946...gine-oils.html Tires are a few years old, but only like 200 miles. The rubber still looked in good condition with no dry rot or anything. The car has been stored in a climate controlled garage, so the rubber hasn't been subjected to any real weathering to accelerate breakdown. |
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#4 | |
![]() Join Date: Apr 2022
Location: NorCal
Posts: 14
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#5 |
![]() Join Date: Dec 2007
Location: NYC
Posts: 1,183
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90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD" |
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#6 |
![]() Join Date: Jan 2021
Location: Beautiful Bavaria
Posts: 523
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Also may I recommend to change the clutch fluid (DOT3 brake fluid) and refresh both, coolant and power steering fluids once you're in there.
Make sure to use the correct antifreeze. As far as clutch is concerned in my case the method of changing what's in the reservoir, pump the pedal 15 times and repeat until fluid stays clean did absolutely NOT work. Better work it through from top to bottom via the bleed valve (not sure if '90 have one).
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ZR-1 #638/1991 |
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#7 | ||
![]() Join Date: Mar 2022
Location: Houston, TX
Posts: 39
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#8 | |
![]() Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,384
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Cleaning does nothing for the problem. Flow testing will cost 50% or more of the cost associated with new injectors and also offers nothing in return to combat the problem. The correct solution is to replace all 16 injectors with new ones (not from GM or ACDelco old stock). So, it's not a "just in case" but more like a matter of when, unless you are able to use only 100% gasoline.
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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#9 | |
![]() Join Date: Mar 2022
Location: Houston, TX
Posts: 39
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So just so I have an updated running list: Oil Change - Driven HR4 10w30 and Wix filter Trans Fluid - Castrol Supercar 10w60 Diff Fluid - Valvoline 75w90 Synthetic + ACDelco limited slip additive Spark Plugs - ACDelco 41-602 gapped to 0.035" Air filter Fuel Filter Replace brake and master cylinder hydraulic fluid (syringe method) Clean PCV and throttle body Check brakes Replace fuel injectors (16) - Intake Plenum Gaskets and feed & return block orings Serpentine Belt Cam cover vent filter Last edited by fastpace; 04-19-2022 at 09:37 AM. |
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#10 | |
![]() ![]() Join Date: Jun 2005
Location: pittsburgh
Posts: 4,633
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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