Owner reviews for engine oil

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RAVENOL

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5.0
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Castrol Engine oil

2014 VW Passat 1.8TSI engine. 249k miles. Did the recommended oil change at every 10k until 125, then every 5 k. Transmission fluid change every 80k, looking back, will switch to 60k, just to be safe.

Pros: regular oil changes, transmission fluid change
Cons: dealer flushed coolant, clogged core
Mileage: 249000 km
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LIQUI MOLY Engine oil

I did ea888 to 155k. 5k oil changes. Change the damn pcv at like 40k IMO maybe 30k. A bad pcv will give you leaks everywhere so just swap em.

Pros: prevents leaks, engine timing good
Cons: pcv failure causes leaks
Mileage: 155000 km
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Motorex Engine 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.

Pros: best in high demand
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OEM Subaru Engine oil

I had a 2017 Forester with 175k miles on it and only used factor oil and never had any issues. I did not do any off road stuff and it was only a premium model, not a wilderness model. I don’t think it matters as long as you change it regularly.

Pros: no issues, engine longevity
Mileage: 175000 km
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IDEMITSU Engine oil

So if you review the virgin oil analysis database, it includes idemitsu 0w-20 and 5w-30 and for both, the TBN is rather weak in comparison to other more readily available blends, also, the viscosity at 9.5 cSt for a 30w, some 20w come close to that. Does any of that matter? Not a whole lot, but it shows that there's nothing special about the oil. Generally speaking, higher TBN is better.

Pros: nothing special about oil
Cons: TBN is rather weak
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