There are some past threads on Bitog that alluded to COSTCO having substantial amounts of custom blended Lubrizol "Ultrazol" additive. From local advertisements posted at the pumps, Shell's Nitro Plus fuel currently hold the crown with 6X the EPA requirement for detergent additives. COSTCO is actually in second place with "5X" the EPA requirement.
Nissan Frontier, 3.8L new engine; what oil?
- Thread starter tiger862
- Start date
A knock sensor is simply a piezo - aka a microphone, that simply tracks the soundwave traveling through the engine on a normal combustion vs abnormal. So its going to pick it up. The question is at that point can the ECU do anything about it? In a boosted engine this is much more difficult.
Still I doubt its LSPI - that really isn't a phenomenon found in non boosted applications, GDI or not.
There is however discussion about using other inputs to pick up LSPI - simply because there more predictive rather than after the fact, which is what a knock sensor is - ie once it sees it - its already happened.
Yeah there was a paper linked here that discussed taking the knock sensor output and doing some sort of analysis that might predict an impending or even occurring LSPI event. But I agree that at that point it is late.
JTK
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It's hard to say what happened to this 3.8. there are a few reports of early bearing failure on some of the early ones.
The GDI 3.5 and 3.8 don't share any of the same parts as far as I'm aware. They look very different in terms of heads, manifolds, timing cover, accessory locations, etc.
The 38DD is definitely the better of the two at this point. Lots of them over 100k miles at this point, given they've been out since 2020.
The 35DD has been in production since 2017. There's lots of reports of them on the boards with sludging to the point of engine destruction. These are much less tolerant than the port injected VQs.
My 2022 Frontier is at about 50k miles at this point. It's yet to visit a dealer for anything.
2020 was the first year the 3.8 was used in that truck. That sounds suspicious to me.
Just got a report of another 3.8 bearing failure. This time 24 Frontier with 4500 miles. Owner stated they want to do a short block. I think with these bearing failures I will go to 5w30 after 1k mile break in since new engine replacement which will be around the first of month. I feel 5w30 will leave more of a film on bearings, especially doing deliveries in this heat. Not worried about warranty finding out as last time Nissan didn't want engine torn down. I keep records however, I never put grade. I guess I will go Valvoline EP 5w30 since I ran out of my stash of 0w20 I got on sale for 1.00 a qt.
P.S. I lost wife and engine in one month so it's been rough.
P.S. I lost wife and engine in one month so it's been rough.
