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OIL LEAK

John Deere · S100 Lawn Tractor 17.5 HP 42 in.

John Deere S100 Lawn Tractor 17.5 HP 42 in. OIL LEAK Error Fix: Engine Oil Leak

Oil dripping from engine area. Causes: loose or missing drain plug, worn crankshaft seal, valve cover gasket leak (V-twin engines), oil filter o-ring (if equipped), cracked crankcase from impact. Check oil level frequently if leak is present.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error OIL LEAK on the John Deere S100 Lawn Tractor 17.5 HP 42 in. means: Engine Oil Leak. The top-ranked community fix is “Replace Valve Cover Gasket and Hydrostatic Pump Seals” (hard difficulty, ~180 min, DIY cost: $20-$40). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · riding mower

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many riding mower repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $350-$600.

Other John Deere Models with Error OIL LEAK

E130 Lawn Tractor 22 HP 42 in.

riding_mower · 2 fixes

JS26 Self-Propelled Mower 190cc 21 in.

push_mower · 2 fixes

JS46 Walk-Behind Mower 21 in.

push_mower · 2 fixes

S130 Lawn Tractor 22 HP 42 in.

riding_mower · 2 fixes

S240 Sport Lawn Tractor 21.5 HP 42 in.

riding_mower · 2 fixes

X350 Select Series Lawn Tractor 18.5 HP 42 in.

riding_mower · 2 fixes

X570 Multi-Terrain Tractor 24 HP 48 in.

riding_mower · 2 fixes

Z345M Zero-Turn Mower 22 HP 42 in.

riding_mower · 2 fixes

Z355R Zero-Turn Mower 22 HP 48 in.

riding_mower · 2 fixes

Z530M ZTrak Zero-Turn Mower 24 HP 54 in.

riding_mower · 2 fixes

Other John Deere S100 Lawn Tractor 17.5 HP 42 in. Error Codes

BATTERY DEAD

Battery Won't Hold Charge

2 fixes

BELT SQUEAL

Deck Belt Squealing or Slipping

2 fixes

BLADES WON'T ENGAGE

Blades Won't Engage (PTO)

2 fixes

CRANKS NO START

Engine Cranks but Won't Start

2 fixes

DECK VIBRATION

Excessive Deck Vibration

2 fixes

DIES UNDER LOAD

Engine Dies When Mowing

2 fixes

ELECTRICAL SHORT

Blown Fuse or Electrical Problem

2 fixes

ENGINE SURGES

Engine Surges or Hunts

2 fixes

People Also Ask About John Deere S100 Lawn Tractor 17.5 HP 42 in. Error OIL LEAK

What does error code OIL LEAK mean on a John Deere S100 Lawn Tractor 17.5 HP 42 in.?

Error code OIL LEAK on the John Deere S100 Lawn Tractor 17.5 HP 42 in. means: Engine Oil Leak. Oil dripping from engine area. Causes: loose or missing drain plug, worn crankshaft seal, valve cover gasket leak (V-twin engines), oil filter o-ring (if equipped), cracked crankcase from impact. Check oil level frequently if leak is present.

How do I fix error code OIL LEAK on my John Deere S100 Lawn Tractor 17.5 HP 42 in.?

The most successful fix is "Replace Valve Cover Gasket and Hydrostatic Pump Seals" (hard difficulty, ~180 minutes). Estimated DIY cost: $20-$40. HomeMD has 2 community-ranked fixes for this error.

Is error code OIL LEAK on a John Deere S100 Lawn Tractor 17.5 HP 42 in. serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix John Deere S100 Lawn Tractor 17.5 HP 42 in. error OIL LEAK myself?

Yes — the top-ranked community fix ("Replace Valve Cover Gasket and Hydrostatic Pump Seals") is rated hard difficulty and takes about 180 minutes. Tools needed: Socket wrench set, Gasket scraper, Torque wrench, Drain pan, Grease gun.

How much does it cost to repair John Deere S100 Lawn Tractor 17.5 HP 42 in. error OIL LEAK?

DIY cost: $20-$40. Professional repair typically costs $350-$600. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the John Deere S100 Lawn Tractor 17.5 HP 42 in. have?

The John Deere S100 Lawn Tractor 17.5 HP 42 in. has 8 other known error codes, including: BATTERY DEAD (Battery Won't Hold Charge), BELT SQUEAL (Deck Belt Squealing or Slipping), BLADES WON'T ENGAGE (Blades Won't Engage (PTO)), CRANKS NO START (Engine Cranks but Won't Start), DECK VIBRATION (Excessive Deck Vibration), and 3 more.

Which other John Deere models have the OIL LEAK error?

Error code OIL LEAK also appears on 10 other John Deere models: E130 Lawn Tractor 22 HP 42 in., JS26 Self-Propelled Mower 190cc 21 in., JS46 Walk-Behind Mower 21 in., S130 Lawn Tractor 22 HP 42 in., S240 Sport Lawn Tractor 21.5 HP 42 in., X350 Select Series Lawn Tractor 18.5 HP 42 in., and 4 more. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the John Deere S100 Lawn Tractor 17.5 HP 42 in. have?

The John Deere S100 Lawn Tractor 17.5 HP 42 in. has 8 other known error codes:

BATTERY DEAD — Battery Won't Hold Charge (2 fixes)
BELT SQUEAL — Deck Belt Squealing or Slipping (2 fixes)
BLADES WON'T ENGAGE — Blades Won't Engage (PTO) (2 fixes)
CRANKS NO START — Engine Cranks but Won't Start (2 fixes)
DECK VIBRATION — Excessive Deck Vibration (2 fixes)
DIES UNDER LOAD — Engine Dies When Mowing (2 fixes)
ELECTRICAL SHORT — Blown Fuse or Electrical Problem (2 fixes)
ENGINE SURGES — Engine Surges or Hunts (2 fixes)

Which other John Deere models have the OIL LEAK error?

Error code OIL LEAK also appears on 10 other John Deere models:

E130 Lawn Tractor 22 HP 42 in. (riding mower) · 2 fixes
JS26 Self-Propelled Mower 190cc 21 in. (push mower) · 2 fixes
JS46 Walk-Behind Mower 21 in. (push mower) · 2 fixes
S130 Lawn Tractor 22 HP 42 in. (riding mower) · 2 fixes
S240 Sport Lawn Tractor 21.5 HP 42 in. (riding mower) · 2 fixes
X350 Select Series Lawn Tractor 18.5 HP 42 in. (riding mower) · 2 fixes
X570 Multi-Terrain Tractor 24 HP 48 in. (riding mower) · 2 fixes
Z345M Zero-Turn Mower 22 HP 42 in. (riding mower) · 2 fixes
Z355R Zero-Turn Mower 22 HP 48 in. (riding mower) · 2 fixes
Z530M ZTrak Zero-Turn Mower 24 HP 54 in. (riding mower) · 2 fixes

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