2018 Chevrolet Silverado 3500HD: Oil Capacity & Filter Guide

A 2018 Chevrolet Silverado 3500HD takes between 6.0 quarts (for the 6.0L V8 gas engine) and 10.0 quarts (for the 6.6L Duramax diesel engine) of oil with a filter change. Always verify your engine to ensure you use the correct fluid capacity and type.

Quick Answer

Here are the essential specifications for your 2018 Silverado 3500HD oil change:

For the 6.0L V8 Gas Engine (L96):

• Oil Capacity: 6.0 quarts (5.7 liters) with a new filter.
• Recommended Oil Weight: SAE 5W-30.
• Oil Specification: dexos1® Gen 2 (or newer) synthetic blend or full synthetic.
• Oil Filter (OEM): AC Delco PF63E.
• Aftermarket Filter Cross-Refs: Fram PH10575, Wix 57060, Mobil 1 M1-212A.

For the 6.6L V8 Duramax Diesel Engine (L5P):

• Oil Capacity: 10.0 quarts (9.5 liters) with a new filter.
• Recommended Oil Weight: SAE 15W-40 for most conditions; SAE 5W-40 synthetic for cold climates.
• Oil Specification: API CK-4.
• Oil Filter (OEM): AC Delco PF2232.
• Aftermarket Filter Cross-Refs: Fram PH12060, Wix WL10255, Mobil 1 M1-405A.

Capacity by Engine Option

Oil Change Interval

Your truck's Oil Life Monitoring (OLM) system will alert you when it's time for a change. However, intervals vary based on usage.

• Normal Duty: For most users, following the OLM system is sufficient. This typically results in an oil change interval of 7,500 to 10,000 miles. A 'normal' duty cycle involves highway driving in moderate climates with minimal towing or idling.
• Severe Duty: Change your oil every 3,000 to 5,000 miles if your truck is operated under severe conditions. This includes frequent towing/hauling, extensive idling (common on work sites), driving in dusty environments, or making many short trips where the engine doesn't reach full operating temperature. For the Duramax, this is especially critical to engine longevity.

Drain Plug Torque

Properly torqueing the drain plug prevents leaks and damage to the oil pan.

• 6.0L Gas V8: 18 lb-ft (25 Nm).
• 6.6L Duramax V8: 25 lb-ft (34 Nm).

Note: Always use a new drain plug crush washer if equipped, or inspect and replace the drain plug if it has an integrated seal that appears worn. This is a crucial step to prevent drips.

How to Change the Oil

Performing an oil change on a 2018 Silverado 3500HD is a straightforward task for a DIYer.

1. Warm Up: Run the engine for 2-3 minutes to warm the oil, which helps it drain completely.
2. Drain Oil: Position a large drain pan, remove the drain plug, and let the old oil drain for at least 15-20 minutes.
3. Replace Filter: Locate and remove the old oil filter. A filter wrench will be necessary. Lightly coat the gasket of the new filter with fresh oil before installing.
4. Install New Filter: Screw the new filter on by hand until it's snug, then tighten it an additional three-quarters to one full turn. Do not overtighten.
5. Reinstall Drain Plug: Clean the drain plug area and install the plug with a new washer. Torque it to the correct specification.
6. Add New Oil: Using a funnel, add the correct amount of new oil through the oil fill cap on the valve cover. Start with a half-quart less than the specified capacity.
7. Check Level: Wait a few minutes, then check the dipstick. Add oil as needed to reach the full mark. Do not overfill.
8. Reset OLM: Start the engine and let it run for a minute. Check for leaks, then turn the engine off. Follow the procedure in your owner's manual to reset the Oil Life Monitor.

Common Issues / Tips

• Duramax (L5P) Fuel Filter: The L5P Duramax has a large, canister-style fuel filter that is often mistaken for the oil filter by those unfamiliar with the engine. The oil filter is smaller and located on the driver's side of the engine block. The much larger fuel filter/water separator is located on the frame rail. Do not drain it during an oil change.
• Skid Plates: Many 4x4 models are equipped with skid plates that may need to be removed or have an access panel opened to reach the drain plug and oil filter.
• DEF for Diesel: If you have the 6.6L Duramax, remember to keep your Diesel Exhaust Fluid (DEF) tank topped up. Running out will cause the truck to enter a reduced power mode.
• Filter Access: Access to the oil filter, especially on the 6.0L gas engine, is tight. A good quality filter wrench (cap style or strap style) is highly recommended.

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