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Opel 1.8 125HP vs 1.8 140HP Engine: Reliability, Cost Efficiency, and Gas Mileage Comparison

elektronikq 53241 18
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Which Opel 1.8 engine is less prone to problems, cheaper to run, and better for gas/LPG: the 125 HP or the 140 HP version?

The 125 HP version is the better choice if you want lower running costs and plan to use LPG, while the failure rate of both engines is about the same [#16631167] The 125 HP engine has hydraulic lifters, so it does not need valve clearance adjustment, but it can consume some oil [#16631167][#16631401] The 140 HP engine usually does not burn oil, but it has shims/glasses, so valve adjustment is more expensive because it involves removing the camshafts and often the timing belt; people mention roughly 1000 PLN for that job [#16632351][#16633589] If you choose the 125 HP engine, it is cheaper to top up oil than to pay for valve adjustment on the 140 HP version [#16632351] When buying either one, check for oil burning signs, especially gray smoke on cold start [#16631401][#16631720]
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  • #1 16630982
    elektronikq
    Level 25  
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    If I wrote this in the wrong place, I am sorry and please move to the right place:
    The question is which engine is:
    - less emergency and creates fewer problems
    - cheaper to use
    - better for gas
    If anyone has any attention to these engines, please write.
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  • #2 16631167
    zed71
    Level 23  
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    125 gas is better ... because it has valve hydraulics but ... it likes oil a bit. 140 vice versa - it does not take oil but it has glasses - so the regulation costs a little. the failure rate is at the same level.
  • #3 16631194
    elektronikq
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    He likes some oil, i.e. :) ?
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  • #4 16631239
    andrzej20001
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    Ie. he burns him passionately.
  • #5 16631401
    zed71
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    it all depends on how you hit - maybe you do not take it at all but ... it is so. to a lesser extent than tsi Vw but always. The most important thing is to check when buying (gray smoke when starting up cold). you can also go along with the selection of oil (I used to have it but the puki car was driving on castrol it did not take oil, then I changed greed oil for lotus and engine consumed 5l / 10000 km). There are oils for "old" engines and you can finally combine them.
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  • #6 16631613
    elektronikq
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    zed71 wrote:
    (gray smoke when cold starting).

    Does it mean that it takes?
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  • #7 16631720
    zed71
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    among other things, it may also be black. it all depends on burning oil - large amounts - black, small amounts or coolant in the exhaust is gray. if you do not know, better take the mechanic for inspection or get an expert (cost about 250 PLN). unless you buy from the owner, you can ask him about burning oil - maybe he will tell the truth (eg how much he added, what oil, when the engine was made, etc.).
    generally this engine is one of the better (in terms of durability).
  • #8 16631896
    Romulus7874
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    Only what I know 125KM sits in ZA and 140KM in np ZB, so other years and prices.
  • #9 16632054
    elektronikq
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    The mechanic will be on the lookout but I have to decide whether 125 or 140. In the future there will definitely be gas.
  • #10 16632351
    zed71
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    so better take 125 - it's better to add some oil PLN 40 than to pay about PLN 1000 for adjusting the valves.
  • #11 16632605
    elektronikq
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    PLN 1000 valve adjustment? That's it? Why so? What how many km?
  • #12 16633589
    zed71
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    because there are glasses - one costs about 25/30 PLN per piece, i.e. exhaust pumps costs 200-300 PLN (most often regulated) but ... labor wreck - you need to remove the camshafts + a new belt. sometimes a new water pump will come. Regulation should be officially regulated every 30-45kkm but ... you can do it differently - drive until the head drops - the cost is similar but it drags on in time. I had a similar problem myself - I have a motor with glasses and regulation it costs so much (independent mechanic) but I preferred to spend about PLN 1200 for refit of the head and at the same time changed the sockets for hardened (not to burn out) than regulate.
  • #13 16635201
    elektronikq
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    Are the glasses in 1.6 the same as in 1.8. Last for 60,000 he regulated his colleague and paid 400 zlotys.
  • #14 16635319
    zed71
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    yes - these are the same glasses. but the price falls - where can it be so cheaply adjusted? such price is the price of motor regulation with plates (without unrolling the rollers) on the other hand - in ecotec engines, the valves are adjusted every 150kkm (on the gasoline itself) so it's a bit strange that there were already 60 adjustments - maybe it was a check.
  • #15 16705238
    elektronikq
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    It's hard to get a good Opel with this engine. Is there any other car with this unit, eg skoda, seat or other car?
  • #16 16706283
    zed71
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    there is no. skoda, seat have volkswagen engines and opel belonged to gm (currently dog-peugeot, citroen) so you will not buy these cars with this engine. This engine (but with the option k7 - to lpg) was still in the Chevrolet cruze and Orlando, but that's not the price range anymore.
  • #17 16707018
    andrzej20001
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    The only sensible option 1.8t group vw.

    Moderated By CameR:

    Reg. 3.1.11. Do not send messages that do not contribute to the discussion, do not solve the problem of the user.

  • #18 17574018
    elektronikq
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    A 1.8 140km in Insignia A? it's the same ? Can it be done in gas?
  • #19 17575310
    zed71
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    all the engines in the insignia are an "ordinary" Opel engine, so it even tolerates lpg well. read the thread from the beginning and you will know.
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Topic summary

✨ The discussion compares the Opel 1.8 125HP and 1.8 140HP engines, focusing on reliability, cost efficiency, and fuel consumption. The 125HP engine is noted for better oil consumption management due to its hydraulic valve system, while the 140HP engine, which uses solid valve lifters, incurs higher maintenance costs for valve adjustments. Users emphasize the importance of checking for oil burning and coolant issues when purchasing. The 125HP engine is generally recommended for its lower maintenance costs, despite its oil consumption. The conversation also touches on the availability of these engines in other brands, confirming that they are unique to Opel and some Chevrolet models.
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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

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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