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Engine oil Motorex or Lucas
At the end of the day, pretty much anything in spec will work fine.
That being said, I did a bunch of research for my V85 and determined that Motorex Cross-Power does the best in high demand applications. Air cooled engines can have a really wide temp range. That's what I use.
Pros: best in high demand
I have a 2012 gmc terrain 2.4l currently at 202k. I’ve used Lucas oil and restore and protect Valvoline oil the last 50k. Still runs like a gem with 177-182-179-175 compression cylinders 1-4. Used to be 155-149-144-168 before I started using both these oils
Pros: runs like a gem
Mileage: 202000 km
I exclusively have used Lucas oil for my sportster motor for 5 years. The bottle looks cool, that's it. Full synthetic oil, no frills, cheap, and easy to get.
Pros: cheap, easy to get
Cons: no frills
I like the Lucas ones personally.
Pros: user likes it
It works great, maybe a bit expensive. I've run used oil analysis and change it 3-4k miles based on aluminum wear. I don't see a reason to use something else.
Pros: works great
Cons: a bit expensive
I use Motorex semi-synthetic 4t in all of my KTM's over the years in a 15w50 weight. It has never been an issue. I have used Motul 5100 and 7100 in other bikes before, and I prefer the 7100 over the 5100. It feels like the bikes perform better when the temps rise and I'm really riding them hard.
Pros: bikes perform better
Lucas OS works great. It's some amazing stuff, BUT. Do not go over your oil change intervals. Once the Lucas additive starts breaking down it turns to a nasty varnish. Went 7k using synthetic amsoil z-rod and Lucas OS, on a new rebuilt 4.0l. Lost a lifter and ate up the cam lobe.
Pros: amazing stuff
Cons: turns to nasty varnish
Mileage: 7000 km
That looks like you dropped a valve. Yes Lucy’s oil will help. It will lubricate the chamber so you can take out all the pieces.
Pros: will lubricate the chamber
My mechanic added a bunch of Lucas to the oil, which he said might at least quiet it down, and it did. It's quieter now, but I can still hear it at idle.
Pros: quieter engine knock
Cons: still audible at idle
I used the middle one on an old 200,000KM Porsche Cayman S that was burning oil. It made it worse, smoke started coming out of the engine when the oil cap was off and I felt like the engine would soon die.
Cons: made it worse, smoke
Vehicle:
Porsche Cayman
Mileage: 200000 km
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Which engine oil to choose — Motorex or Lucas?
If choosing engine oil across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare engine oil across these categories:
- PR Score.
- Overall ranking.
- Vote balance.
- Average rating.
- Number of reviews.
- Feature ratings.
- Car owners’ choice.
Which engine oil are better — Lucas or Motorex?
In March 2026 on PartReview, engine oil Lucas and Motorex were roughly equal.
- Motorex received a PR Score of 84 out of 100, and Lucas scored 78 points.
- Motorex ranked 27 in the overall ranking, and Lucas ranked 31.
- The average rating is higher for Motorex (4.3) than for Lucas (3.8).
-
Engine oil Motorex have better feature ratings than Lucas:
- Engine noise - owners believe, that this property for Motorex is better than Lucas.
- Exhaust smoke - drivers claim, that this property for Lucas is outperforms Motorex.
- Warning light - reviews suggest, that this property for Lucas is preferred to Motorex.
Which engine oil are more popular — Motorex or Lucas?
In March 2026 on PartReview, engine oil Lucas were overall more popular than Motorex.
By vote balance, engine oil Lucas surpassed Motorex:
- For Motorex, the ratio of positive (44) to negative (8) votes is 36 votes.
- For Lucas, the ratio of positive (58) to negative (16) votes is 42 votes.
By number of reviews, engine oil Lucas surpassed Motorex:
- For engine oil Motorex there are 16 reviews: 12 positive, 4 neutral, 0 negative.
- For engine oil Lucas there are 23 reviews: 16 positive, 5 neutral, 2 negative.
Which engine oil do car owners prefer — Motorex or Lucas?
In March 2026, according to PartReview, engine oil Motorex and Lucas have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.
Other comparisons of engine oil
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of engine oil Motorex with: Mobil, Castrol, LIQUI MOLY, MOTUL, Shell, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota.
Also available: comparisons of engine oil Lucas with: Mobil, Castrol, LIQUI MOLY, MOTUL, Shell, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota.
You can also see who is better among other engine oil manufacturers: Mobil or Castrol, Mobil or LIQUI MOLY, Mobil or MOTUL, Mobil or Shell, LIQUI MOLY or Castrol.