Post whatever is on your mind!!

ZR · 05-05-2024, 09:53 PM

In some cases the PCV contributes to the problem but bulk of what ends up in the catch can is directly related to how poor a job your oil is actually doing and in the case of a DI engine, it's a cost the engine can not deal with. It's ridiculously easy to test, replace the 0W or 5W oil with something thats heavier (no not 5w30 instead of 5w20, move to 10w30) and you will instantly see a difference, a difference that will continue to cut down on the sludge the can catches. My Coyote is what we typically see, barely a trace in the can on heavier oil, yes even after a full day of lapping with it buzzing 7-7500 rpm all day. Same results in everything we've tested. Spin off of all this, your now using oil that will actually protect the engine long term.

**ChickenLips** · 05-06-2024, 07:04 PM

There's more to oil than viscosity. With my turbo diesel van I was specifically warned off of Mobil for high NOAC. Dealer and OEM uses and spec's Mobil 1 for fuel economy and CAFE, don't care about fouling. I got a raft of info from a Mercedes mechanic and diesel guru on this. High catch can capture might be related to oil volatility.

ZR · 05-06-2024, 09:22 PM

The mfg does not give a rats behind about you and how long your engine lives, CAFE CAFE CAFE is all that matters and of course getting bulk of the iron they put out to hang in long enough to get the hell outta warranty. So many of the mfgs are seeing premature catastrophic engine failures these days.

**True Blue** · 05-07-2024, 07:59 AM

Rick, what oil weight are you using in Kath's Santa Fe? I've been using Pennzoil Syn 5w-30, since it was new. Thinking of switching to 10w-30 for the next oil change after seeing the amount of oil caught in the catch can.