FAQ
TL;DR: Typical inspection costs ~250 PLN; “this engine is one of the better (in terms of durability).” Choose 125 HP if you want lower LPG upkeep, 140 HP if you prefer lower oil usage but can budget for valve adjustments. [Elektroda, zed71, post #16631720]
Why it matters: This FAQ helps used‑car shoppers decide between Opel’s 1.8 125 HP and 1.8 140 HP for reliability, running costs, and LPG fitment.
Quick Facts
- 125 HP uses hydraulic lifters; tends to consume some oil but needs no periodic valve lash adjustment. [Elektroda, zed71, post #16631167]
- 140 HP uses shim “glasses”; low oil usage but requires paid valve adjustments over time. [Elektroda, zed71, post #16631167]
- Typical valve service: shims ~25–30 PLN each; job can require camshaft removal and a new belt. [Elektroda, zed71, post #16633589]
- Rule‑of‑thumb cost choice: “add ~PLN 40 of oil” vs “~PLN 1000 for adjusting the valves.” [Elektroda, zed71, post #16632351]
- Insignia A 1.8 is an ordinary Opel unit and tolerates LPG well. [Elektroda, zed71, post #17575310]
Which is more reliable overall: Opel 1.8 125 HP or 1.8 140 HP?
Failure rate is similar. The 125 HP has hydraulic lifters and may use some oil. The 140 HP usually uses little oil but needs periodic shim adjustments. For buyers prioritizing minimal workshop visits, 125 HP is simpler. “This engine is one of the better (durability).” [Elektroda, zed71, post #16631167]
How do smoke colors on cold start help me spot problems?
Gray exhaust can suggest coolant or light oil burn. Black smoke points to higher oil burn or rich mixture. If you are unsure, book a pre‑purchase expert inspection; typical checks cost about 250 PLN. This small spend can prevent costly surprises. [Elektroda, zed71, post #16631720]
How much oil can a tired Opel 1.8 consume?
A user reported about 5 liters per 10,000 km after an oil brand change. Consumption varies by engine condition and oil choice. Always check cold‑start smoke, service history, and top‑up records. Bring the right oil spec to a viewing. [Elektroda, zed71, post #16631401]
How often should I adjust valves on the 1.8 140 HP (shim type)?
Official guidance mentioned spans roughly every 30–45 thousand km. The job can involve camshaft removal, and many owners coordinate it with timing belt service. Keep receipts to track intervals. Plan budget ahead to avoid deferred maintenance. [Elektroda, zed71, post #16633589]
Why is 140 HP valve adjustment expensive?
It uses shim “glasses,” each ~25–30 PLN. Labor is the big chunk, because camshafts may need removal and a new belt fitted; sometimes a water pump too. As one owner put it, “there are glasses—one costs about 25/30 PLN per piece.” [Elektroda, zed71, post #16633589]
What happens if I skip valve clearance checks on shim engines?
You can drive until problems appear, but you risk valvetrain damage. One owner chose a head refit for ~1200 PLN and hardened seats to prevent burn‑out. Delays can convert routine service into a top‑end rebuild. [Elektroda, zed71, post #16633589]
Which 1.8 is better if I plan to run LPG?
Pick 125 HP for lower upkeep because hydraulic lifters avoid paid lash adjustments. The 140 HP tolerates LPG but adds shim service costs to the ownership profile. Budget decides the smarter fit for long‑term LPG driving. [Elektroda, zed71, post #16631167]
How should I inspect a used Opel 1.8 before buying?
Do this: 1) Cold‑start and check smoke color. 2) Ask the seller about oil top‑ups, oil type, and any engine work. 3) Hire an expert inspection; typical cost is ~250 PLN.
[Elektroda, zed71, post #16631720]
Should I choose 125 HP or 140 HP on a tight budget?
Go 125 HP. As one poster said, it’s better to add ~PLN 40 of oil than pay ~PLN 1000 for valve adjustment. This keeps routine costs predictable and low for daily driving. [Elektroda, zed71, post #16632351]
Are these Opel 1.8 engines shared with Skoda or Seat?
No. Skoda and Seat used Volkswagen Group engines. Opel belonged to GM at the time. Similar units appeared in Chevrolet Cruze and Orlando, including an LPG‑ready variant code. Cross‑shopping VAG 1.8T is a different platform. [Elektroda, zed71, post #16706283]
Is the 1.8 140 HP in Insignia A suitable for LPG conversion?
Yes. It’s an ordinary Opel engine that handles LPG well with a quality kit and installer. Follow service intervals, especially valve checks if shimmed. Proper calibration helps preserve valves and economy. [Elektroda, zed71, post #17575310]
Which model years or trims carry 125 HP vs 140 HP?
A forum note indicates 125 HP appears with “ZA,” while 140 HP pairs with “ZB,” implying different years and pricing. Confirm on a specific VIN before purchase, because trims and markets vary. [Elektroda, Romulus7874, post #16631896]
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