I use Mazdas 5w-30 Ultra DPF. Mazda once said that this was the oil that they're using, so I guess what's used by mazda can't be too bad for the rex
Pros: used by Mazda
Vehicle:
Mazda
Owner reviews for engine oil
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Any synthetic - I like the Amsoil.
Pros: I like the Amsoil
Vehicle:
Volvo
I use Castrol Synthetic 10w-30 on mine.
It’s thicker oil, so I feel like it gives the engine better protection. With 272k miles on it, I figured why not.
Pros: better engine protection
Cons: thicker oil
Mileage: 437734 km
Mobil1 x1 1000 15w40 in all my cars. My engines are clean and quiet, oil pick-ups don't clog, there's a nice permanent oil coating everywhere.
Pros: engines clean and quiet
I’ve been running Castrol GTX 10w30 conventional in my 9000 Aero. Brought it to a Saab specialist and he recommended it. Need to have the valve seals redone and the oil is thick enough that it doesn’t get past the seals and no smoke. No issues running it. I change it every 3 months regardless of how far I’ve driven.
Pros: no issues running it
Cons: thick enough, no smoke
Vehicle:
Saab 9000
Just came across this. Mine is a 2024 w 31 hours. I always used Motorex but I’m trying T6 this time. I use it in all my other off road bikes. In the 2t it’s just the clutch and trans. Also I’m changing it every 10 hrs
Shell Rotella T6. It's marketed as heavy diesel oil, but it meets the exact same specs as mobil 1 full synthetic and just has some extra detergent like diesel oils do.
This oil in OG 9-3 that have the crankcase retrofit kits clean the entire engine very well after a few oil changes getting rid of and preventing any sludge issues. The oil even eliminated some nasty tappet noise due to low oil pressure in my 2002 9-3 after a few seconds when I bought it.
Pros: cleans engine, eliminates tappet noise
Cons: marketed as heavy diesel oil
Vehicle:
Saab
I'm apparently the least informed person here (never done an oil analysis), but FWIW I seem to be fine with Mobil-1 0w40 on a 996.2 with 208k miles.
Pros: fine with Mobil-1
Vehicle:
Porsche
Mileage: 334745 km
I just found this thread. I have a 2014 Jetta 1.8t with 107k that I bought for my daughter two years ago and it burns through a quart of oil about every month. It dropped cyinder 1 similar to what the other person experienced, but new plugs and ignition coils solved the problem.
Pros: solved the problem
Cons: burns through oil
Vehicle:
Volkswagen Jetta
Mileage: 172201 km
I used 0-40 mobil 1. It turned out pretty bad for me, I ended up using more oil than I ever had before. The car smelled like a friggin chainsaw with that stuff. The engine only had like 100k on it, but the blowby was horrible with 0-40. This was just my experience. I use mobil 10-40 now and no problems so far.
Pros: no problems so far
Cons: blowby was horrible
Mileage: 100000 km
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