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Audi S4 Differential Service & Maintenance Parts

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Rear Differential Service Kit

ES#4158614 - n90281802ktKT1 - Rear Differential Service Kit - Complete kit with Redline 75w90 fluid with ECS stainless steel magnetic plugs and seals to service your rear differential. - Assembled By ECS - Audi Volkswagen

Complete kit with Redline 75w90 fluid with ECS stainless steel magnetic plugs and seals to service your rear differential. 10X Entries Into Our F80 M3 Sweepstakes
For vehicles with Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
4158614
Mfg#:
N90281802KTKT1
In Stock
ON SALE! SAVE 17%
$114.99

This product was last offered at the strikethrough price on
05-02-2026

$95.96 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Hightec TOPGEAR SAE 75W-90 S - 1 Liter

ES#5374135 - 25002-0010-99 - Hightec TOPGEAR SAE 75W-90 S - 1 Liter - Fully synthetic, multigrade gearbox oil of performance rating API GL-4/5 for multi-functional use in axle gears and manual gearboxes - ROWE - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Fully synthetic, multigrade gearbox oil of performance rating API GL-4/5 for multi-functional use in axle gears and manual gearboxes

Brand:
ROWE - Corporate Logo
ES#:
5374135
Mfg#:
25002-0010-99
In Stock
$19.99 USD
Free Shipping
on orders $49 and up

Rear Differential Service Kit

ES#3660793 - n90281802ktKT - Rear Differential Service Kit - Complete kit with Redline 75w90 fluid with OEM drain/fill plugs and seals to service your rear differential. - Assembled By ECS - Audi Volkswagen

Complete kit with Redline 75w90 fluid with OEM drain/fill plugs and seals to service your rear differential. 10X Entries Into Our F80 M3 Sweepstakes
For vehicles with Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
3660793
Mfg#:
N90281802KTKT
In Stock
ON SALE!
$53.99

This product was last offered at the strikethrough price on
04-24-2026

$52.29 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Rear Differential Service Kit - With Service Tools

ES#4361552 - N90281802KTKT4 - Rear Differential Service Kit - With Service Tools - Complete kit with Redline 75w90 fluid with ECS stainless steel magnetic plugs and seals to service your rear differential. - Assembled By ECS - Audi Volkswagen

Complete kit with Redline 75w90 fluid with ECS stainless steel magnetic plugs and seals to service your rear differential. 10X Entries Into Our F80 M3 Sweepstakes
For vehicles with Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
4361552
Mfg#:
N90281802KTKT4
In Stock
ON SALE! SAVE 17%
$161.99

This product was last offered at the strikethrough price on
05-02-2026

$134.22 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Rear Differential Service Kit - With Service Tools

ES#4361551 - 0AR409399BKT4 - Rear Differential Service Kit - With Service Tools - Complete kit with OE fluid to service your rear differential - Genuine Volkswagen Audi - Audi

Complete kit with OE fluid to service your rear differential For vehicles without Torque Vectoring differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4361551
Mfg#:
0AR409399BKT4
Ships on Sep 11, 2026
$159.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plug

ES#2580731 - 016409399BKT2 - Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plug - Complete kit with Redline 75w90 fluid to service your rear differential - Assembled By ECS - Audi

Complete kit with Redline 75w90 fluid to service your rear differential 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
2580731
Mfg#:
016409399BKT2
Ships in 6 Business Days
ON SALE! SAVE 14%
$135.99

This product was last offered at the strikethrough price on
05-02-2026

$116.90 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

75W-85 Differential Oil - 1 Liter

ES#4840668 - 000989730411PDNW - 75W-85 Differential Oil - 1 Liter - One (1) Liter Bottle - MB 235.7 / MB 239.7 Spec - Genuine Mercedes Benz - Audi Mercedes Benz

One (1) Liter Bottle - MB 235.7 / MB 239.7 Spec

Brand:
Genuine Mercedes Benz - Corporate Logo
ES#:
4840668
Mfg#:
000989730411PDNW
Ships in 1-2 days
6% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$82.00

This product was last offered at the strikethrough price on
08-24-2026

$76.99 USD
Free Shipping
on orders $49 and up

Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plug

ES#3677577 - g052145s2kt4KT - Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plug - Complete kit with Genuine Audi 75w90 fluid to service your rear differential - Assembled By ECS - Audi

Complete kit with Genuine Audi 75w90 fluid to service your rear differential 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
3677577
Mfg#:
G052145S2KT4KT
Ships in 6 Business Days
ON SALE!
$158.99

This product was last offered at the strikethrough price on
05-02-2026

$149.15 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Max-Gear Gear Oil 75w90 - 1 Quart

ES#263484 - 01300 - Max-Gear Gear Oil 75w90 - 1 Quart - Max-Gear is recommended for use in front or rear open differentials, manual transmissions, and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid - Royal Purple - Audi BMW Volkswagen Mercedes Benz Porsche

Max-Gear is recommended for use in front or rear open differentials, manual transmissions, and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid

Brand:
Royal Purple - Corporate Logo
ES#:
263484
Mfg#:
01300
In Stock
$22.99 USD
Free Shipping
on orders $49 and up

Rear Differential Service Kit

ES#3659102 - n10037106KT6 - Rear Differential Service Kit - Complete kit with Redline 75w90 fluid with OEM Drain/Fill plugs to service your rear differential - Assembled By ECS - Audi Volkswagen

Complete kit with Redline 75w90 fluid with OEM Drain/Fill plugs to service your rear differential 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
3659102
Mfg#:
N10037106KT6
In Stock
ON SALE!
$86.21 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Rear Differential Leak Repair Kit

ES#2593503 - 02D525596BKT - Rear Differential Leak Repair Kit - Complete kit with OE fluid to service your rear differential - Genuine Volkswagen Audi - Audi Volkswagen

Complete kit with OE fluid to service your rear differential For vehicles with Torque Vectoring differentials

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2593503
Mfg#:
02D525596BKT
Ships in 3 Business Days
$259.99 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Rear Differential Service Kit

ES#2678603 - N10037106KT3 - Rear Differential Service Kit - Complete kit with Genuine Audi 75w90 fluid to service your rear differential - Genuine Volkswagen Audi - Audi

Complete kit with Genuine Audi 75w90 fluid to service your rear differential

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2678603
Mfg#:
N10037106KT3
Ships in 3 Business Days
$215.99 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plugs

ES#2593489 - 0AR409399BKT1 - Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plugs - Complete kit with Redline 75w90 GL-5 fluid to service your rear differential - Assembled By ECS - Audi

Complete kit with Redline 75w90 GL-5 fluid to service your rear differential 10X Entries Into Our F80 M3 Sweepstakes
For vehicles without Torque Vectoring differentials

Brand:
Assembled By ECS - Corporate Logo
ES#:
2593489
Mfg#:
0AR409399BKT1
Ships in 6 Business Days
ON SALE! SAVE 20%
$128.65

This product was last offered at the strikethrough price on
05-02-2026

$103.48 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Large Transmission Drain Funnel

ES#2938591 - ATD5192 - Large Transmission Drain Funnel - Extend you catch area by adding this funnel - ATD Tools - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Extend you catch area by adding this funnel

Brand:
ATD Tools - Corporate Logo
ES#:
2938591
Mfg#:
ATD5192
Ships in 1 Business Day
$59.99 USD
This product is lifetime replacement eligible Lifetime Replacement

Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plug

ES#2538236 - 016409399BKT - Rear Differential Service Kit - With ECS Magnetic Drain/Fill Plug - Complete kit with Motul Gear 300 fluid to service your rear differential - Assembled By ECS - Audi Volkswagen

Complete kit with Motul Gear 300 fluid to service your rear differential 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
2538236
Mfg#:
016409399BKT
Ships in 6 Business Days
ON SALE!
$110.99

This product was last offered at the strikethrough price on
05-02-2026

$109.68 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Synthetic Gear Oil - GL-5 75w90 - 1 Liter

ES#2872900 - G052145A1 - Synthetic Gear Oil - GL-5 75w90 - 1 Liter - Synthetic fluid to keep your gears running smooth - Febi - Audi BMW Volkswagen

Synthetic fluid to keep your gears running smooth We Price Match - Give Us A Call or Chat!
1.9L needed for drain & refill

Brand:
Febi - Corporate Logo
ES#:
2872900
Mfg#:
G052145A1
Ships on Nov 19, 2026
$22.99 USD
Free Shipping
on orders $49 and up

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