I use rotella 15w-40, high zinc content but my engine also has 230k miles
Pros: high zinc content
Mileage: 230000 km
Owner reviews for engine oil
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I've been using Mobil 1 10w30 regular and now High-Mileage Synthetic for decades and most of the Jeeps life.
Pros: High-Mileage Synthetic
Vehicle:
Jeep
5-30 Valvoline restore & protect is working wonders on my 2.5. Visibly cleaning out deposits and engine running stronger
Pros: engine running stronger
There’s been a lot of advancements in oils since the YJ was new. I use Mobil 1 0w40 in mine due to its excellent temperature range and proven endurance.
Pros: excellent temperature range
I use one oil - shell rotella. It goes in my XRL my 4.0 Jeep and my 7.3IDI diesel ????
Vehicle:
Jeep
I use Castrol Magnatec A3/B4 10W-40 part synthetic. 3 years now and no problems.
Pros: no problems, 3 years
Mobile 1 full synthetic 0W-20 every 5K. My engine hums like a top.
Pros: engine hums like top
Mileage: 5000 km
I always used gn4 but switched to rotella t6 15w40 cheaper, full synthetic. it can handle the heat alittle better and I like the shift quality over gn4. Walmart has it for cheap
Pros: handle the heat better
Cons: cheaper, full synthetic
My changes have generally been religious at 5k and that didn’t save my GTI from losing compression in cyl3 at 37k untuned miles it suffered 15% leakdown vs the other 3. That car got M1 0w-40, tried and true stuff, so you just never know.
Pros: tried and true stuff
Cons: didn’t save from losing compression
Vehicle:
Volkswagen
Mileage: 59546 km
Part number: 0W-40
I switched to Rotella T6 (5w-40 Full Synth) after running Penzoil, Chevron, Castrol, Mobil, regular non-high mileage 10w-30 dinos in that order over 4000 miles. Worst of this bunch was Mobil and Chevron, the HLA tick was unbearable, even right after the oil change.
Pros: engine cleaned up
Cons: HLA tick unbearable
Mileage: 4000 km
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