Direct Inject Turbo car with 125k miles and short commute, what's best?

[MVAR]

Wouldn't an oil catch can help?

That was the thought back then but they didn’t seem to do much in the way of preventing coking. They did catch stuff but the buildup seemed to happen just as fast with or without

 

[Vitamin Yoda]

That was the thought back then but they didn’t seem to do much in the way of preventing coking. They did catch stuff but the buildup seemed to happen just as fast with or without

Leaky valve stem seals? Seems to be a common issue with older Hyundai GDI engines as well.

 

[MVAR]

Leaky valve stem seals? Seems to be a common issue with older Hyundai GDI engines as well.

With the amount of people tracking the same issue on the old Mazda speed forum, I’d doubt it. The pcv system was known to lose ring seal on those engines as well.