Fluids

Rush SR fluid specifications — engine oil (Mobil 1 Racing 4T 10W-40), differential (Royal Purple 75W-140), brake fluid (AP Racing 600), coolant, chain lube, and grease specs.

Pro Tip — Oil Analysis

It is highly recommended to take oil samples for analysis AND cut open oil filters at every oil change. This catches internal engine wear early and can prevent catastrophic failures.

Engine Oil

The Rush SR uses a shared oil system for the engine, gearbox, and clutch.

Recommended: Mobil 1 Racing 4T 10W-40

Capacity: 3 qt without filter change | 3.5 qt with filter change

Change interval: Every 8 hours

Oil Filter: K&N Performance KN-138

Other oils may be used. If substituting, use a JASO MA certified oil (PAO/Ester Group IV+, Viscosity Index 170+). Summer alternatives: Klotz KV-1560R 15w-60, Motul 300V 15w-60. Check with your dealer if unsure.

Air Filter

Generation

OEM Part

Alternative

Gen I (Throttle by Cable)

Suzuki 13780-47H10

K&N SU-9915

Gen II (Drive-by-Wire)

Suzuki 13780-48K00

DNA Filter P-S10GT22-01

Differential

Recommended: Royal Purple SAE 75W-140

Capacity: 8–10 oz drain and replace (partial) | 16 oz full flush and fill

Pro Tip — Differential Fill

Clock the diff so drain plugs are at 12 and 3 o'clock. Fill until fluid runs out the side (9 o'clock hole).

Brake Fluid

Recommended: AP Racing 600 Racing Brake Fluid

Or use an equivalent non-synthetic DOT 4 with a dry boiling point in excess of 570°F.

Raise the rear of the car as high as possible when bleeding brakes to migrate air out of the master cylinders.

Fuel

Any 91 or 93 octane premium fuel.

E10/ethanol blends are acceptable for normal use. When storing the car for 2 months or more — especially with an ethanol blend — drain the fuel as completely as possible and refill on the day you will run.

Coolant

Recommended: Distilled water with Red Line Water Wetter

DO NOT use antifreeze or glycol-based coolants for track use. Glycol is a safety hazard if spilled on track and is not permitted.

Capacity: ~3 gallons when empty

Cold-weather storage/transport only: G40 Pink coolant at 20% mix — drain completely and refill with distilled water + Water Wetter before returning to track use.

Chain Lube

Recommended: Maxima Chain Wax

Clean chain before lubing. Use a naphtha-based chain cleaner (Maxima CS75920 or similar) — rinse thoroughly and do not let dry on chain before re-lubing.

Greases & Specialty Lubricants

Application

Specification

hashtagEngine Oil

hashtagAir Filter

hashtagDifferential

hashtagBrake Fluid

hashtagFuel

hashtagCoolant

hashtagChain Lube

hashtagGreases & Specialty Lubricants