FWD transmission/differential fluid — GL4, not GL5

Tags: #transmission-fluid · #price · #part-number · #mkpp

Correct spec. The FWD transmission/differential unit on the X80 requires GL4 (75W-80) gear fluid, not GL5 (75W-90).

Why it matters. GL5 is formulated for different drivetrain applications — specifically hypoid gears found in differentials on rear-drive/live-axle setups. Using GL5 in this FWD transmission application violates the manufacturer spec, even though both GL4 and GL5 sometimes appear together on generic "allowed fluids" lists from some parts sources — that listing is misleading for this specific application.^{123456789101112}

Widely-used product — Mannol EXTRA GETRIEBOEL 75W-90 (2024-08 report; check the dual GL-4/GL-5 rating against the GL4-only spec above before assuming compatibility). Manual gearbox capacity is 2.95 L. Mannol EXTRA GETRIEBOEL 75W-90 (marketed as API GL-4/GL-5 LS, synthetic) is the most commonly used fluid reported by owners — note it carries a dual GL-4/GL-5 rating rather than a GL-4-only rating, so buyers concerned about the GL4-vs-GL5 spec distinction documented above should independently verify this product's suitability rather than assume the GL-5 co-rating is automatically fine for this application. Fill/drain procedure: drain from the bottom, fill via the side inspection plug until level reaches the fill hole. Quality caveat: some owners report Mannol 75W-90 quality issues — one unit developed difficult gear engagement after about 1 month of use. Aral is a reported alternative for owners wanting to avoid that risk; UIDNU and QH brands were also used successfully by other owners without the same complaint.^{13141516171819202122}

Spec, viscosity and products (2026-09/10 reports). Victor, checking the owner's manual, reads the manual gearbox (manual transmission, MKPP / МКПП) spec as GL-4 75W-80 and insists on GL-4, not GL-5 or dual GL-4/5; he fitted Gazpromneft GL-4 75W-80 (litre packs) when replacing the gearbox seal and suggests ZIC 75W-85 for a thicker oil.²³²⁴²⁵ He believes Mazda 6 manual boxes use 75W-85 (unconfirmed), and said that a higher second number (80 vs 85) means thinner oil — the opposite of the usual convention, where a higher number is thicker.²⁴²⁵ Andrey is more relaxed: any oil matching the manual's viscosity is fine.²⁶ Capacity is 2.95 L: the TOM'S site lists the 5-speed MKPP at 2.95 L and has no matching TOM'S fluid, so the carmaker's spec applies.²⁷ A search-engine answer shared in the chat suggests TOM'S 75W-90 GL-5, RAVENOL MTF-2 75W-80 and Totachi GL-4 75W-90; the GL-5 item contradicts the GL-4 spec above.²⁸ Prices: Gazpromneft GL-4 75W-80 about 1,000 RUB per litre (RU market, Sep 2026);²³ REDUX 75W-90 GL-4 "for MKPP" on a marketplace sale at 3,386 RUB, down from 9,252 RUB (RU market, Oct 2026).²⁹

GL-5 in a manual gearbox — owner debate (2026-10). A 2022 forum screenshot (vk.ru comments) says GL-5 additives attack brass synchronizers, so only GL-4 should be used; a reply in the same screenshot says 12 years on TAD-17 in an 08 gearbox caused no problems and that the bronze fear is overstated.³⁰ Sergey notes that GL-5 is intended for final drives (редуктор).³¹

Change interval. Victor says the service schedule (регламент) calls for a manual gearbox oil change at 40,000 km;³² owners do it later: Andrey every 50,000 km (he had reached 139,000 km), серега planned 52,000 km and Марина changed at 58,000 km.²⁶³³³⁴ See also the maintenance interval schedule.

Filling. Romanych filled the gearbox through the side check (контрольное) hole from a 1-litre canister with a long spout;³⁵ Victor filled from underneath with a 160 ml syringe, describing about 20 insertions to get it all in.³⁶

Media

Photo of a gear-oil bottle referencing Mannol fluid specs shared during the manual-transmission oil discussion

Photo of a transmission oil bottle (Mannol 75W-90) labeled SAE 75W-90, API GL-4/GL-5 LS, synthetic

Second gear-oil product photo shared as confirmation of a fluid purchase for the manual transmission

Product-listing screenshot from Ozon for the gear oil discussed in this thread

Marketplace listing photo: REDUX 75W-90 GL-4 gear oil "for MKPP" (manual gearbox), sale price 3,386 RUB with 9,252 RUB struck through

Screenshot of a search answer recommending TOM'S 75W-90 GL-5, RAVENOL MTF-2 75W-80 and Totachi GL-4 75W-90 for the FAW Besturn X80 manual gearbox

Screenshot of the TOM'S site: 5-speed MKPP fluid volume 2.95 L, no suitable TOM'S fluid, use the carmaker's spec

Screenshot of vk.ru comments (2022-2024): GL-5 additives are harmful to brass synchronizers so only GL-4 should be used; a reply says 12 years on TAD-17 in an 08 gearbox caused no issue

Related pages

• Transmission fluid change intervals and costs
• Automatic transmission (AKPP) — ATF fluid & intervals
• Engine/transmission sump guard
• TPMS sensor battery type and design
• Filter part numbers and kit pricing

Sources

This page is compiled from 36 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-10-29