Rust Protection for Automotive Components
Automotive components mix cast iron, plated steel and sintered parts, each with its own surface and process. MOERY grades are matched part by part.
What puts metal at risk
Corrosion in this sector rarely has a single cause. These are the conditions we see most often.
Humidity & condensation
Parts sit in warehouses and lineside racks where humidity cycles cause condensation on cold metal.
Export shipping
Weeks of sea freight bring temperature swings and salt-laden air.
Fingerprints & handling
Bare machined surfaces corrode where hands touch them.
Multiple surface types
Cast iron, plated, phosphated and sintered parts each need a different film.
Downstream processes
Films must not interfere with assembly, cleaning or painting.
Porous parts
Sintered parts trap water in micro-pores.
Matching the grade to the part
Start with the part and the process; the grade follows.
| Part / situation | Recommended grade | Why |
|---|---|---|
| Cylinder heads and liners (cast iron) | KG-2B / KG-3B | Formulated for cast iron; KG-3B does not yellow |
| Plated, black oxide and phosphated fasteners | KG-2C / KG-3C | Light oil feel; extends salt-spray life |
| Sintered gears, bushings | KG-4A / KG-4B | Penetrates micro-pores and displaces water |
| General steel shafts and gears | KG-2 / KG-3 | General-purpose, 1–2 years |
| Parts leaving a water-based washer | KG-10 | Displaces water before the film forms |
| Export shipments with long transit times | KG-8 | 3–5 years on precision parts |
Products for this application
Fast-Drying Rust Preventive Oil for Cast Iron
- Formulated for cast iron, with strong penetration
- 1–2 years when bagged
Fast-Drying Rust Preventive Oil for Plated & Phosphated Surfaces
- Seals plated, black oxide and phosphated surfaces
- Light oil feel
Fast-Drying Rust Preventive Oil for Powder Metallurgy
- Low viscosity and high penetration
- Enters micro-pores and displaces water
Fast-Drying Rust Preventive Oil for Steel, Copper & Aluminum
- 1–2 years of protection; 2–3 years with plastic-bag packing
- Dense, thin film once the solvent evaporates
Water-Displacing Fast-Drying Rust Preventive Oil
- Strong water displacement
- 1–2 years of protection on steel
Typical parts
- Cylinder heads and liners
- Engine blocks and castings
- Gears, shafts and bearings
- Fasteners and clips
- Sintered structural parts
Frequently asked questions
Which oil suits cast-iron cylinder heads?
KG-2B (deep brown) or KG-3B (light yellow, non-yellowing) — both are cast-iron grades with strong penetration.
Can plated fasteners be protected without a heavy oily feel?
Yes — KG-2C / KG-3C leave a light oil feel and extend salt-spray life on plated and phosphated parts.
How are sintered parts protected?
KG-4A / KG-4B are low-viscosity oils that enter micro-pores and displace water.
Will the oil affect painting or welding?
Remove the film before painting or welding, and validate the result in your own process.
Can I request samples?
Yes. Use the contact form and tell us the part, the metal and the process.
Protect your components with confidence
Tell us the metal, the process and the protection period you need — a corrosion protection specialist will recommend a grade and arrange samples.