PennGrade 1 Gear Oil | VW Air-Cooled Transaxle | GL-4 80W-90 (27-7729-6)

PennGrade 1 Multi-Purpose Gear Oil — GL-4, 80W-90 (1 qt)

A high-quality conventional gear oil for manual transmissions and transaxles that specifically require API GL-4 (not GL-5). The VW air-cooled transaxle is a GL-4 application — using GL-5 in it can attack the brass synchros over time.

Vehicle Fitment

• VW Air-Cooled Transaxle: Type 1, Type 2, Type 3, Type 4 manual transmissions — the correct gear oil for your VW box
• Any manual transmission: requiring API GL-4 specification

Why Choose PennGrade 1?

PennGrade 1 is the modern brand name for the legendary "Brad Penn" green oil — refined in Pennsylvania from paraffinic crude, long a favorite of vintage and air-cooled engine builders. Made in the USA.

Key Features & Benefits

• Correct GL-4 spec: safe for the brass synchronizer rings used in the VW transaxle.
• 80W-90 grade: conventional multi-purpose gear oil for manual gearboxes.
• Transaxle capacity: approximately 2.5 quarts for a Type 1 transaxle, ~3 quarts for Type 2/Type 4.

Technical Specifications

• EMPI Part #: 27-7729-6
• Grade: 80W-90
• API: GL-4
• Volume: 1 quart bottle, sold individually (case of 12)
• UPC: 707924570403
• Country of Origin: USA

Frequently Asked Questions

• Why GL-4 and not GL-5 in a VW transaxle? GL-5 gear oils contain higher levels of sulfur-phosphorus extreme-pressure additives needed for hypoid differentials, but those additives corrode brass synchronizer rings in manual gearboxes over time. The VW transaxle uses brass synchros, so use GL-4 (this product), not GL-5.
• How much do I need for a VW transaxle? Approximately 2.5 quarts for a Type 1 transaxle and about 3 quarts for Type 2/Type 4.

Explore Related Categories

Oils & Lubricants · Transaxle Components · Drivetrain & Transmission