I have a 99 Vette that will hit 100k miles this year; overall the car runs strong and has been mostly reliable for me, albeit I do get a little tick on a cold start after sitting which goes away after getting up to temperature. I have had my balancer changed, plugs/wires, and major fluids changed already in the past year.

As I reach the century mark, is there any proactive maintenance I should look to do on my LS1, or just keep changing the oil regularly?

 

100k is a landmark for us car guys, but your Vette wont skip a beat. I's do nothing special other than follow the factory recommended maintenance.

Congrats!

 

If the fuel filter is original, I'd change it.

 

100k, as I recall, is the first major maintenance point for the car, except for things like oil changes, air filters, and some fluids like coolant. I don't recall everything that is supposed to be changed - there are several things; spark plugs are one. Everything is in the shop manual, and perhaps even in the owner's manual.

 

OP has already done plugs. I recommend changing EVERY fluid that hasn't been. Coolant, brake fluid, clutch fluid, trans fluid, gear oil, power steering fluid.

 

So do I - at least a couple of times by 100k. Dexcool already calls for 5-year change.

 

In May of 2021 I pulled my 1999 coupe in for a round of PM and fixes at 109,000 miles.

Removed
RideTech HQ coilovers (sent out to be rebuilt and be used on Z06 project)
AlkyControl pump + kit for Z06
AEM gauges/wires and dash/head unit for Z06

Installed
Powerbond hub with ARP bolt
Timing cover gasket
Vortex BPP ram air + filter
New breather for catch can
Relocated catch can in front of radiator for easy service
C6 Z51 front spring
C5 Z06 rear spring
Centric high carbon cryo rotors
Z26 pads
Flushed brakes with Motul RBF 600
Map sensor
Delco water pump
Gates idlers pulleys
Moog end links
Energy suspension bushings for ride height bolts
Grade 8 9/16" lowering bolts in rear
NGK TR55 plugs
Spare coils back on valve covers with Z06 MSD wires
Adjusted e-brake shoes to be tight
Fresh gaskets at cat-back connection
New O2s and replaced some burned wires, then shielded and hung all wires aside properly
Flushed clutch with Motul RBF 600
New alternator
Accessory Belt
A/C belt
Bilstein shocks
Flushed PS system ranger / turn method
Cleared udders
Replaced weather stripping around Hoop
Replaced weather stripping around Windshield
Factory CD head unit and dash went back in, and added an aux-in feed to the glove box to which I connected a BT adapter powered off the charger. Stock head unit, upgraded speakers, stealth BT phone music... very nice!


The car has been fine for a year until last week when I believe the brake master went. I have a replacement ready to go but have been immobile with a non-covid bug. Wednesday looks to be warm enough. This spring I want to flush trans and diff when I do the Z06 also. And I would love to find a way to fix the visors without replacing them entirely though that will probably be a lost cause. All that done...... I do believe I will be listing her for sale in the Spring as well, if not late Winter.