What kind of oil are you guys using?

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TARDIS B

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I use Valvoline synthetic. I tried Quaker State, but it left carbon buildup on the filter and chunks in the filter housing. Valvoline is definitely a better oil.
 
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I normally use castrol 5w30 synthetic in the black container for the subaru. I used the 5w20 quaker state synthetic in the hyundai I had and it ran quiet and oil looked brand new at 5k oil changes.

That got wrecked though.

I decided this round I'd go with the Quaker state 5w30 synthetic in both the nox and the subaru.

I run wix xd filters on both the subaru and the nox.

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TARDIS B

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I changed to Pennzoil. It cost less than Valvoline. I'm now thinking Valvoline is causing carbon build up and that's why the QS drained with carbon build up on filter because it was actually cleaning out what Valvoline is depositing.
 

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