Consumables
Products used by X1/9 owners in Australia. Available at your local auto shop or online.
Engine Oil
Castrol MAGNATEC 10W-40
View product →A popular modern choice for X1/9 owners in Australia. While the original manual recommends a 15W/40 or SAE 40 for temperatures above 35°C, this 10W-40 semi-synthetic improves on that spec by providing faster oil flow to the overhead cam during cold starts (10W), while maintaining the necessary protection at operating temperature (40). Its unique "clinging" molecules provide protection for the X1/9's flat-tappet camshaft during the critical warm-up period. Best suited to standard camshaft engines driven regularly — if you have a high-lift racing cam, consider a 1100+ ppm oil instead.
Penrite Classic Light (20W-60)
View product →Premium mineral with high Zinc, designed for 1950–1989 vehicles. Contains a "Tacky Additive" that clings to cam lobes during storage, preventing the dry-start wear that causes most camshaft damage in classic cars. Built-in corrosion inhibitors protect against internal condensation. Seal-safe for original rubber and paper gaskets.
Penrite Semi Synthetic 15W-40
View product →High-quality semi synthetic with full Zinc protection. Matches the original factory-specified viscosity exactly. Widely available, excellent value, and safe for catalytic converters. A solid all-rounder for fuel-injected models.
Penrite 10 Tenths Racing 15 (15W-50)
View product →100% PAO & Ester full synthetic with extremely high Zinc (2200+ ppm). Ester molecules cling to metal surfaces for instant protection at start-up. "Shear Free" formulation eliminates viscosity loss under extreme conditions. Not recommended for engines with original 40-year-old seals — the synthetic base can dissolve old rubber and paper gaskets.
Penrite 10 Tenths Running-In Oil (15W-40)
View product →Non-friction-modified mineral oil for freshly rebuilt engines. High Zinc protects valve train while allowing piston rings to bed in correctly without bore glazing. Use for the first 1,500–2,000 km, then drain and switch to regular oil.
Quick Comparison
| Specification | Castrol MAGNATEC | Penrite Classic Light | Penrite Semi Synth | Penrite Racing 15 | Penrite Running-In |
|---|---|---|---|---|---|
| Viscosity | 10W-40 | 20W-60 | 15W-40 | 15W-50 | 15W-40 |
| Oil Type | Semi-Synthetic | Mineral | Semi-Synthetic | Full Synthetic 100% PAO & Ester |
Mineral |
| Zinc (ZDDP) | ~840 ppm | ~1200+ ppm | ~1100 ppm | 2200+ ppm | ~1600+ ppm |
| API Rating | SN/CF | SG/CD | SP | SN/CF | SF/CC |
| Carburettor Models | ✓ Yes | ✓ Ideal | ✓ Yes | ✓ Ideal | ✓ Yes |
| Fuel Injected + Cat | ✓ Ideal | ✗ No | ✓ Yes | ✗ No | ✗ No |
| Flat-Tappet Safe | ✓ Good | ✓ Excellent | ✓ Good | ✓ Excellent | ✓ Excellent |
| Old Seal Safe | ✓ Yes | ✓ Yes | ✓ Yes | ✗ Caution | ✓ Yes |
| Cat Converter Safe | ✓ Yes | ✗ No | ✓ Yes | ✗ No | ✗ No |
| Cold Start Flow | ✓ Excellent | ● Slow | ✓ Good | ✓ Good | ✓ Good |
| Hot Weather (35°C+) | ✓ Good | ✓ Excellent | ✓ Good | ✓ Excellent | ✓ Good |
| Best For | Modern daily driver, stock cam | Classic cars, weekend & storage | Budget daily, factory spec | Track, rebuilt with new seals | First 1,500 km of new engine only |
Why Oil Choice Matters for the X1/9
The X1/9's SOHC engine uses a flat-tappet camshaft — a design where the cam lobes slide directly against the lifters. This metal-on-metal contact requires high levels of Zinc (ZDDP) in the oil to prevent premature wear. Modern oils have significantly reduced their Zinc content to protect catalytic converters in newer cars, which makes them a poor choice for our engines.
The factory manual specifies 15W-40 (Oliofiat Multigrado), and that remains the correct baseline. In Australian conditions a slightly heavier hot-viscosity is acceptable, but seal compatibility matters just as much as zinc levels — full synthetic PAO/Ester oils can dissolve old rubber and paper gaskets, causing leaks in engines that haven't been rebuilt with modern seals.
Penrite Classic Light (20W-60)
- Premium mineral oil designed for 1950–1989 vehicles
- High Zinc — 1500+ ppm ZDDP, excellent flat-tappet protection
- Low detergency — won't strip decades of harmless carbon from old gaskets
- Seal-safe mineral base — no risk to original rubber or paper seals
- "Tacky Additive" — the oil clings to cam lobes and tappets instead of draining back to the sump. Even after weeks of sitting, a protective film stays bonded to the metal, preventing the "dry start" wear that causes most camshaft damage in classic cars
- Built-in corrosion inhibitors protect against internal condensation during storage
Penrite Semi Synthetic 15W-40
- High-quality semi synthetic blend
- Full Zinc content — ~1000 ppm ZDDP, safe and effective for street use
- Matches the original factory-specified viscosity exactly
- Widely available and excellent value
Penrite 10 Tenths Racing 15 (15W-50)
- 100% PAO & Ester full synthetic
- Extremely high Zinc — 2200+ ppm ZDDP
- Ester molecules cling to metal surfaces for instant protection at start-up
- 15W-50 — thicker than the factory 15W-40 spec when hot
⚠ Carburettor vs. Fuel Injection — Oil Choice is Not the Same
Carburetted Models (1978–1983 in Australia)
No catalytic converter — use high-zinc oils (1200–1500+ ppm ZDDP) for maximum camshaft protection. The Penrite Classic Light 20W-60 is the best match. Carburetted engines are prone to fuel dilution from rich running, so change oil every 5,000 km or 6 months. The thicker viscosity (20W-60) compensates for fuel thinning the oil.
Fuel-Injected Models (1988+ in Australia, Bosch L-Jetronic)
If your X1/9 retains its catalytic converter, do not use high-zinc oils above 1200 ppm — the phosphorus in ZDDP creates ash that coats and eventually destroys the cat. Use a quality 10W-40 or 15W-40 semi-synthetic with moderate zinc (800–1000 ppm). The Penrite Semi Synthetic 15W-40 listed above is a good match. If your cat has been removed or replaced with a free-flow exhaust, this restriction doesn't apply.
Gearbox Oil
Castrol Syntrans 75W-85
Manual Transmission Fluid. Also commonly used for the steering rack.
Brake Fluid
Penrite Brake Fluid Super DOT 3
Standard brake fluid suitable for most X1/9 applications.
Penrite Brake Fluid Super DOT 4
Higher boiling point for spirited driving or track use.
Coolant
Nulon Green Premium Long Life Premix Coolant
Premixed coolant suitable for the X1/9 cooling system. 6 years / 500,000 km.
Penrite Green OEM Coolant
OEM-approved green coolant concentrate. 8-year protection.
Filters
Wesfil Air Filter WA291 (A291)
Honda cross-reference. Fits the 1300cc X1/9.
Ryco Oil Filter Z418
Standard oil filter for the X1/9.
Batteries
Century NS70X MF
View product →Ultra Hi Performance 4WD Battery. 720 CCA, 150 RC, 82 Ah.
Century NS70 MF
View product →Ultra Hi Performance 4WD Battery. 650 CCA, 140 RC, 75 Ah.
Spark Plugs
NGK BPR6ES
Standard copper core spark plug for the X1/9.
NGK BPR7ES
Colder plug suited to modified engines or spirited driving.
Additives
Red Line SI-1 Fuel System Cleaner
Fuel system cleaner to keep injectors and carburettors clean.
Tyres
Live pricing from Australian tyre retailers for 13-inch tyres that fit the X1/9. Prices from Tempe Tyres, Tyroola, JAX and Bob Jane include fitting. Supercheap Auto prices are tyre only.
Checking tyre availability…