100K Service

Complete 100,000 mile maintenance service including engine oil, transmission fluid, differential fluid, coolant, air filter, spark plugs, and full inspection of brake system, suspension, and drivetrain components.

Warnings

Tools required

Parts

• Engine oil filter × 1 — ACDelco PF63E or equivalent
• Oil drain plug crush washer × 1 — Use OEM specification
• Engine air filter × 1 — ACDelco A3139C or equivalent
• Cabin air filter × 1 — ACDelco CF3238 or equivalent
• Spark plugs (8) × 8 — ACDelco 41-110 Iridium, gap 0.040 inch
• Automatic transmission fluid filter kit × 1 — ACDelco 24276870 or equivalent
• Transmission pan gasket × 1 — Use OEM specification

Fluids

• ACDelco dexos1 0W-20 — 8.5 qt
• ACDelco Dexron VI ATF — 11.5 qt
• ACDelco 75W-90 Synthetic Gear Oil — 2 qt
• ACDelco DEX-COOL (Orange) — 18 qt
• ACDelco DOT 4 Brake Fluid — 1 qt

Preparation

1. Park vehicle on level surface and allow engine to cool completely (minimum 2 hours).
2. Gather all required fluids, parts, and tools before beginning work.
3. Raise vehicle using floor jack at manufacturer-specified lift points and secure on jack stands at all four corners.
4. Remove all four wheels and store safely. Torque wheel lug nuts to specification during reassembly.
5. Place wheel chocks behind jack stands for additional safety.
6. Install fender covers to protect paint during engine compartment work.
7. Have adequate lighting available for underbody inspection and service.

Procedure

1. 1

   Engine oil and filter change
   Locate oil drain plug on passenger side of oil pan. Position drain pan underneath and remove drain plug, allowing oil to drain completely (approximately 15 minutes). Remove oil filter located on driver side of engine block using oil filter wrench. Clean filter mounting surface and apply thin film of new oil to new filter gasket. Install new filter hand-tight plus 3/4 turn. Install new crush washer on drain plug and torque to specification. Fill engine with 8.0 quarts of dexos1 0W-20, then start engine and check for leaks. Let idle for 2 minutes, shut off, wait 5 minutes, then check level and add remaining 0.5 quart as needed to reach full mark.
2. 2

   Replace engine air filter and cabin air filter
   Open hood and locate air filter housing on driver side of engine bay. Release spring clips securing air box cover and remove cover. Remove old air filter and inspect housing for debris or dirt. Clean housing if necessary and install new air filter ensuring proper seating. Reinstall cover and secure clips. For cabin filter, open glove box and remove stops to allow full drop. Press sides inward to release glove box completely. Remove cabin air filter access door by pressing release tabs. Slide out old filter noting airflow direction arrow. Install new filter with arrow pointing toward rear of vehicle. Reinstall access door and glove box.
3. 3

   Replace spark plugs
   Remove engine cover by pulling upward on front edge to release grommets. Disconnect ignition coil connectors on all eight cylinders. Remove mounting bolt from each coil pack and carefully pull coils straight up from valve cover. Use compressed air to blow debris from around spark plug wells. Using spark plug socket with extension, remove all eight spark plugs. Inspect old plugs for abnormal wear, fouling, or damage. Verify new plugs are gapped to 0.040 inch specification. Apply small amount of anti-seize to plug threads (avoid getting on electrodes). Install new plugs finger-tight, then torque to 15 Nm (11 lb-ft) - this specification not in provided list so tighten an additional 1/16 turn after seated. Reinstall coil packs and torque mounting bolts to sensor bolt specification. Reconnect all coil connectors.
4. 4

   Drain and replace rear differential fluid
   Locate rear differential drain plug at bottom rear of differential housing. Position drain pan underneath and remove drain plug using 3/8 inch square drive. Allow fluid to drain completely. Clean drain plug and surrounding area. Reinstall drain plug and torque to mounting bolt specification. Locate fill plug on front driver side of differential housing. Remove fill plug. Using fluid transfer pump and 3/8 inch diameter tubing, pump 2.0 quarts of ACDelco 75W-90 Synthetic Gear Oil into differential until fluid reaches bottom of fill hole and begins to seep out. Reinstall fill plug and torque to mounting bolt specification.
5. 5

   Transmission fluid and filter service
   Locate transmission fluid pan underneath vehicle centered behind engine. Position large drain pan underneath. Remove all transmission pan bolts except two at front corners, loosening these two partially. Carefully pry pan down at rear to break gasket seal and allow fluid to drain into pan. Once drained, remove final two bolts and lower pan completely. Note orientation of old filter. Remove filter by pulling straight down - additional fluid will drain. Clean all gasket material from pan and transmission housing using plastic scraper. Remove and clean magnets from pan, inspecting for excessive metal debris (small amounts normal). Install new filter pushing firmly upward until seated. Position new gasket on pan and align pan to transmission. Install all pan bolts and torque in cross pattern to cover screw specification. Locate transmission fill plug on passenger side of transmission. Remove plug and using transmission fill adapter and pump, add approximately 5 quarts of Dexron VI initially.
   ⚠Transmission pan will contain 4-5 quarts of hot fluid. Loosen slowly and be prepared for fluid release.
6. 6

   Complete transmission fluid fill procedure
   Start engine and allow to idle. With parking brake applied and foot on brake pedal, shift through all gear positions (P-R-N-D-L) pausing 3 seconds in each position. Return to Park. With engine still running at idle, check fluid level at fill hole. Fluid should be at bottom edge of fill hole opening. Add additional Dexron VI as needed until fluid just begins to seep from fill hole. Total capacity is approximately 11.5 quarts but actual amount depends on how much remained in torque converter and cooler lines. Reinstall fill plug and torque to connector bolt specification. Allow transmission to reach operating temperature (15 minute drive), then recheck level while running and top off if necessary.
7. 7

   Coolant system drain and refill
   Ensure engine is completely cool. Place large drain pan underneath radiator. Locate radiator petcock drain valve on driver side bottom of radiator. Open drain valve by turning counterclockwise and allow coolant to drain completely. Remove radiator cap and engine block drain plugs (one on each side of block) to ensure complete drainage. Close petcock and reinstall block drain plugs hand-tight plus 1/4 turn. Fill cooling system with 50/50 mixture of DEX-COOL and distilled water using radiator fill neck until full. Install radiator cap. Fill coolant reservoir to cold fill line. Start engine and allow to reach operating temperature with heater on high. Monitor coolant level and add as needed. Once at operating temperature and thermostat opens, coolant level will drop - add additional coolant to maintain full level. After initial fill, expect to add coolant as air purges from system over several heat cycles.
   ⚠️Never open cooling system when hot. System is pressurized and can cause severe burns.
8. 8

   Brake fluid flush and replacement
   Locate brake fluid reservoir in rear driver side of engine bay. Using turkey baster or fluid evacuator, remove as much old brake fluid as possible from reservoir. Refill with fresh ACDelco DOT 4 brake fluid to MAX line. Beginning with wheel farthest from master cylinder (passenger rear), attach bleeder hose to bleeder valve and submerge other end in catch container. Have assistant pump brake pedal 5 times and hold. Open bleeder valve 1/4 turn until fluid flows, then close valve before pedal reaches floor. Repeat until fluid runs clear and new. Maintain reservoir level throughout process. Repeat procedure for driver rear, passenger front, then driver front wheels. After all corners completed, verify firm brake pedal and check reservoir level. Top off to MAX line with DOT 4 fluid.
   ⚠Do not allow brake fluid reservoir to run empty during bleeding or air will enter system requiring complete re-bleed.
   ℹ️DOT 4 brake fluid damages paint. Clean any spills immediately.
9. 9

   Comprehensive inspection
   With vehicle raised, perform thorough inspection of all major components. Check all brake pads and rotors for wear (minimum pad thickness 3mm, rotor minimum thickness stamped on rotor). Inspect brake lines and hoses for cracks, bulging, or leaks. Examine all suspension components including ball joints, tie rod ends, control arm bushings, and shock absorbers for wear, damage, or leaking. Check CV axles and u-joints for play or torn boots. Inspect exhaust system for leaks, damage, or loose hangers. Check drive belt for cracks, glazing, or fraying - replace if needed (serpentine belt should be replaced at 150K miles). Examine all fluid levels and check for leaks around engine, transmission, transfer case, and differentials. Inspect battery terminals for corrosion and test battery voltage (should be 12.4-12.6V key off). Check all lights, horn, and windshield wipers for proper operation.
10. 10

    Final inspection and reinstall wheels
    Double-check that all drain plugs, fill plugs, and fasteners are properly tightened. Verify no tools or parts are left in engine bay or underneath vehicle. Clean any spilled fluids from frame and suspension components. Reinstall all four wheels, starting lug nuts by hand to ensure proper thread engagement. Torque lug nuts to specification in star pattern. Lower vehicle from jack stands using floor jack. With vehicle on ground, perform final torque of all lug nuts in star pattern. Reset oil life monitoring system: Turn ignition to ON position without starting engine, fully depress and release accelerator pedal three times within 5 seconds, oil life should reset to 100%. Start engine and verify no warning lights. Check for any fluid leaks underneath vehicle.

Reassembly

1. Ensure all protective covers and shields removed during service are properly reinstalled.
2. Verify engine cover is seated properly on all mounting grommets.
3. Confirm all fluid caps (oil, coolant, brake, etc.) are tightened securely.
4. Dispose of all used fluids and filters at appropriate recycling facility.
5. Record service date and mileage in vehicle maintenance log.

Verification

• Start engine and verify smooth idle with no unusual noises, vibrations, or warning lights.
• Check all fluid levels after engine reaches operating temperature and top off as necessary.
• Test drive vehicle for minimum 15 minutes, operating transmission through all gears and reaching highway speeds.
• After test drive, re-inspect all service points for leaks with vehicle raised.
• Verify brake pedal feel is firm and brakes operate normally with no pulsation or noise.
• Confirm transmission shifts smoothly through all gears with no slipping or harsh engagement.
• Recheck all fluid levels after vehicle has cooled and top off as needed.
• Monitor for leaks and fluid consumption over next 100 miles of driving.

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