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I run Fuchs Titan Truck 15w40 in my Cummins 6BT, engine was rebuilt about 50,000ks ago, seems to go alright with this oil
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.
I can whole heartedly recommend Fuchs Silkolene oils, it actually quieted down my sv compared to Motul.
Am bagat si eu Fuchs intr-un 3.0tdi si in romania 1L e 60 de lei cam asa dar pe [Ebay.de](http://Ebay.de) e 35 de lei litrul la fel si Aral, ciudat de ieftin. Motorul merge cam cu 10'C mai putin la ulri fata de castrol(se ducea si la 119'C pe autostrada)
4.5 L is the Ideal for Mazda 6 2.5 non turbo, I'm from the same country as you. I'm using fuchs titan 5w30 for two years and I recommend you do the same, I noticed quieter engine.
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.
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.
Oil that I used is Fuchs
It takes a “synthetic blend” of motorex 15W50 oil. And uhh yeah works good I guess, don’t have to change it too often, and as far as performance goes, it doesn’t really matter because I’m on restricted power anyways so yeah ????♂️
Eu stau pe fuchs la 1.5 dci cu norma 0720. Nici nu se compara cu motul, pe mine m-a lasat rece
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In March 2026 on PartReview, engine oil FUCHS were overall better than Motorex.
In March 2026 on PartReview, engine oil FUCHS were overall more popular than Motorex.
By vote balance, engine oil FUCHS surpassed Motorex:
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Also available: comparisons of engine oil FUCHS with: Mobil, Castrol, LIQUI MOLY, MOTUL, Shell, AMSOIL, VALVOLINE, PENNZOIL, RED LINE, OEM Toyota.
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