MNJWS High-Volume Oil Pump for 4.8L–6.0L Vortec V8 — Direct-Fit Replacement, Increased Flow

MNJWS high volume oil pump is a direct-fit replacement that increases oil flow and pressure for 4.8L, 5.3L, 5.7L and 6.0L GM Vortec V8 engines used in Silverado, Sierra, Yukon, Escalade and related models.

If your GM Vortec V8 is used for towing, high-RPM driving, or performance upgrades, the stock oil pump can become a bottleneck. This MNJWS unit is engineered to match the bolt pattern and internal geometry of common GM high-volume pumps (like Melling M295HV and GM part numbers 12696357 / 12586665) while raising oil delivery and pressure to better protect bearings and valvetrain under stress. The pump arrives as a complete assembly and carries a 12-month warranty.

How does this pump improve lubrication for high-RPM or heavy-load use?

This pump delivers increased flow and slightly higher pressure compared with many factory units, helping maintain oil film and cooling under heavier engine demands. It reduces the risk of momentary starvation during long pulls, high RPM runs, or modified engines.

• Higher volumetric flow targeted for V8 Vortec oil galleries.
• Better pressure stability during sustained high RPM and torque loads.
• Robust gear and housing materials for improved longevity.

Which vehicles and engines is it compatible with?

Designed for GM Vortec small‑block V8s, this pump fits a wide range of Chevrolet, GMC and related models from late 1990s through 2020s when equipped with 4.8L, 5.3L, 5.7L or 6.0L engines. It follows the OEM mounting and drive interface for a direct replacement swap.

• Fits Chevrolet: Silverado, Suburban, Tahoe, Avalanche, Camaro, Express, Trailblazer.
• Fits GMC: Sierra, Yukon, Savana, Envoy and similar platforms.
• Also compatible with Cadillac Escalade and Buick Rainier V8 models using listed displacements.

Does this pump replace specific OEM or aftermarket part numbers?

Yes — the MNJWS pump is made to replace common GM and aftermarket high-volume oil pump numbers and replicates the form, fit and functional interface of those parts. It’s intended as an economical upgrade or service replacement.

• Direct replacement for GM part numbers like 12696357 and 12586665.
• Functionally replaces Melling M295HV style high-volume pumps.
• Ships as a complete assembly ready for install, no core return required.

What can I expect during installation and ownership?

Installation is straightforward for any technician familiar with GM small‑block oil pump service — it uses the same mounting points and drive. MNJWS provides a 12‑month limited warranty and customer support should you need guidance.

• OEM-style bolt pattern and drive shaft alignment for simple swap-in.
• Preassembled unit reduces bench work; gasket and seal prep recommended.
• 12 months warranty and direct seller support for fitment questions.

Who is this for? If you own a GM Vortec V8 truck or SUV (4.8L–6.0L) and you tow regularly, drive at high RPM, have engine modifications, or simply want added durability beyond stock, the MNJWS High Volume Oil Pump is a practical upgrade. It’s also suitable for mechanics and DIYers seeking a cost-effective, direct-fit replacement that matches common OEM and Melling high-volume pumps while improving lubrication performance under increased demands.