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Checked oil specs by engine

2018 Ram 2500 oil capacity, type & filter

The 2018 Ram 2500 takes 7 qt of 5W-20 (5.7L V8) and 7 qt of 0W-40 (6.4L V8) and 12.1 qt of 15W-40 (6.7L 6-Cyl Turbo Diesel). Select your engine below before buying.

2018 Ram 2500 oil specs by engine
Engine Capacity Oil Type Filter
5.7L V8 7 qt 5W-20 WIX 51032
6.4L V8 7 qt 0W-40 WIX 51032
6.7L 6-Cyl Turbo Diesel 12.1 qt 15W-40 AMSOIL EA15K01

Match one of 3 checked engine options before buying oil or a filter.

5.7L V8
Capacity 7 qt i Capacity condition is not listed in the checked data, so confirm whether the service-fill amount includes a new filter before adding oil. See how we verify. Learn how we verify fitment Verified fit Buy at least 7 qt total; listed capacity is 7 qt.
Oil type 5W-20 OEM oil approval is not source-backed on this page; confirm the bottle or owner's manual before checkout. Verified fit
Oil Filters Options cross-checked
WIX Shown first 51032 Search 51032 WIX 51036 Search 51036 WIX 51040 Search 51040 WIX 51042 Search 51042 PG2222 Search PG2222 Purolator L12222 Search L12222

WIX 51032 is copied into the checkout checklist below. Other listed filters are source-backed alternatives.

6.4L V8
Capacity 7 qt i Capacity condition is not listed in the checked data, so confirm whether the service-fill amount includes a new filter before adding oil. See how we verify. Learn how we verify fitment Verified fit Buy at least 7 qt total; listed capacity is 7 qt.
Oil type 0W-40
A3/B4
Verified fit
Oil Filters Options cross-checked
WIX Shown first 51032 Search 51032 WIX 51036 Search 51036 WIX 51040 Search 51040 WIX 51042 Search 51042 PG2222 Search PG2222 Purolator L12222 Search L12222

WIX 51032 is copied into the checkout checklist below. Other listed filters are source-backed alternatives.

6.7L 6-Cyl Turbo Diesel
Capacity 12.1 qt i Capacity condition is not listed in the checked data, so confirm whether the service-fill amount includes a new filter before adding oil. See how we verify. Learn how we verify fitment Verified fit Buy at least 13 qt total; listed capacity is 12.1 qt.
Oil type 15W-40 i Based on 1 checked source: AMSOIL Lookup. Additional cross-check is still pending: a second checked oil-type source. Use it as a reference, then confirm the viscosity grade for this engine before checkout. See how we verify. Learn how we verify fitment Above -18°C OEM oil approval is not source-backed on this page; confirm the bottle or owner's manual before checkout.
Oil Filters Options cross-checked
AMSOIL Shown first EA15K01 Search EA15K01 AMSOIL EA15K02 Search EA15K02 AMSOIL EA15K03 Search EA15K03 AMSOIL EA15K04 Search EA15K04 ULTRA-POWER 57620 Search 57620 Purolator L45335 Search L45335

AMSOIL EA15K01 is copied into the checkout checklist below. Other listed filters are source-backed alternatives.

4 sources checked Last checked: 2026-06-27 How we verify →

Where to Buy View Data Sources
Buy oil & filters:
Walmart → AutoZone → Amazon → O'Reilly →
Full synthetic options for 5W-20
Mobil 1 Extended Performance 5W-20 → Castrol GTX Magnatec 5W-20 → Pennzoil Platinum 5W-20 →

Search paths only — confirm your OEM viscosity spec and quantity before checkout.

Full synthetic options for 0W-40
Mobil 1 0W-40 → Castrol Edge 0W-40 → Liqui Moly Leichtlauf 0W-40 →

Search paths only — confirm your OEM viscosity spec and quantity before checkout.

2018 Ram 2500 oil specs: capacity conditions and filter notes

Which engine applies?

Check the door jamb sticker, owner's manual, or displacement badge on the engine cover. Match it to the engine options listed above before buying oil or a filter.

Filter part numbers

All listed filter part numbers are compatible alternatives for your vehicle. Choose any one brand, then confirm the exact part number at checkout.

Verify before checkout

Retailer fitment tools may use different data. Confirm oil capacity, viscosity, and filter part number before ordering.

Source coverage for the 2018 Ram 2500

Capacity sources

Supported by AMSOIL Lookup and Castrol (Olyslager).

Oil type sources

Supported by AMSOIL Lookup and Castrol (Olyslager).

Filter sources

Supported by RockAuto, Purolator Part Finder, and AMSOIL Lookup.

Source coverage

4 checked source rows for the 2018 Ram 2500.

Before ordering for this 2018 Ram 2500

Checkout verification checklist
5.7L V8 Verified fit Buy →
Capacity
7 qt
Oil type
5W-20
Interval
4,000 mi
Filter
WIX 51032
6.4L V8 Verified fit Buy →
Capacity
7 qt
Oil type
0W-40
Interval
8,000 mi / 12 mo
Filter
WIX 51032
6.7L 6-Cyl Turbo Diesel Buy →
Capacity
12.1 qt
Oil type
15W-40 (Above -18°C)
Filter
AMSOIL EA15K01

Source check: Last checked 2026-06-27 from AMSOIL Lookup, RockAuto, Purolator Part Finder, and Castrol (Olyslager).

Same oil specs on other 2018 Ram models

3500

Ram 2500 oil specs by year

This table includes checked Ram 2500 model years available in our database.

Year Capacity Oil type Filter
2025 7 qt (multiple engines) 0W-40 PG2222
2024 7 qt (multiple engines) 0W-40 Purolator L12222
2023 7 qt (multiple engines) 0W-40 WIX 51032
2022 7 qt (multiple engines) 0W-40 CHAMP / LUBER-FINER PH48
2021 7 qt (multiple engines) 0W-40 CHAMP / LUBER-FINER PH48
2020 7 qt (multiple engines) 0W-40 WIX 51032
2019 7 qt (multiple engines) 0W-40 WIX 51032
2018 Current page 7 qt (multiple engines) 5W-20 WIX 51032
2017 7 qt (multiple engines) 5W-20 WIX 51032
2016 7 qt (multiple engines) 5W-20 WIX 51032
2015 7 qt (multiple engines) 5W-20 WIX 51032
2014 7 qt (multiple engines) 5W-20 WIX 51032
2013 7 qt (multiple engines) 5W-20 WIX 51032
2012 7 qt (multiple engines) 5W-20 AMSOIL EA15K01
2011 7 qt (multiple engines) 5W-20 AMSOIL EA15K01

How we verified 2018 Ram 2500 oil data

How we verify fitment

Checked fitment data. Last checked: 2026-06-27.

This page checked 4 sources for the 2018 Ram 2500. The table lists which checked source contributed capacity, oil type, or filter evidence.

We checked leading oil brands and aftermarket filter catalogs so you don't have to.

Confidence
Cross-check pending i Some oil fields are based on checked source data but still need stronger cross-check evidence. Review area: 6.7L 6-Cyl Turbo Diesel oil type. Use the listed values as references and confirm the exact engine before ordering or adding oil. See how we verify. Learn how we verify fitment
Sources checked
4
Last checked
2026-06-27
Field-level source support
  • Capacity: AMSOIL Lookup and Castrol (Olyslager)
  • Oil type: AMSOIL Lookup and Castrol (Olyslager)
  • Filter: RockAuto, Purolator Part Finder, and AMSOIL Lookup
  • Change interval: AMSOIL Lookup and Castrol (Olyslager)
Source Supports Checked Link
AMSOIL Lookup Capacity, Oil type, Filter 2026-06-27 Visit brand site
RockAuto Filter 2026-06-27 Checked source
Purolator Part Finder Filter 2026-06-27 Visit brand site
Castrol (Olyslager) Capacity, Oil type 2026-06-27 Visit brand site

2018 Ram 2500 maintenance checklist

One part checked. Look up the rest while you're here.

Where to buy

These are retailer search paths for your vehicle. The specs above are checked — use the retailer's vehicle selector at checkout to confirm before ordering.

This section may include affiliate or sponsored retailer links. They are purchase paths, not fitment evidence.

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