Which engine oil?

[Chris141084]

Is anyone using a 10w40 oil in their de? I normally use 5w40 but as I've just hit 120000miles I was thinking of going a little thicker. But is it worth it? 

[davey_83]

Switching to 10w40 will be no thicker than 5w40 once up to temperature? I've recently switched from 5w30 to 5w40, and noticed smoother idle and a tad more psi also.

[Chris141084]

So would it be worth going to 5w50 to help slow down oil usage? Or should I just stick with what I'm using? Just trying to make my engine last longer before I have to rebuild it

[davey_83]

I'd stick with the 5w40 and fit a catch can.

[Chris141084]

Thanks mate 

[Flashback]

Personally I'm running 10w40 in my DE (116k) and it's absolutely fine. I was also looking at the catch can route as a possible but was recommended to go up to 10w40 as a better alternative.

 

The reason being the larger lower end molecules should have less chance of passing the wearing seals.

[davey_83]

That's it, however thinking out loud the thicker oil on cold start up will create more pressure thus greater blowby and take longer to reach the valve train......

[Chris141084]

These are the things I've had running around my head for a while, I do plan to replace my piston rings in the near future. Just wanna nurse her along until I can get it done

[ilogikal1]

Check levels and top up regularly as required. Provided you don't run low on oil the only damage you're doing is likely to your cats... if you still have them.

[davey_83]

Manufacturer states 1000 miles can see 1litre usage. 

[Flashback]

7 hours ago, davey_83 said:

Manufacturer states 1000 miles can see 1litre usage. 

So if the manufacturer states up to 1l per 1000 miles why do people get so worried if they get to that consumption level? It's not really excessive of Nissan say that's quite normal.

[Ekona]

Because regardless of what they say, that's not normal and is definitely excessive. That's an awful lot of oil to be using, and you have to think about where it's going. If every single engine used that much then fine, it's by design, but it's only dodgy Revup or very worn engines that do so you have to take the logical view and realise that's way too much. These are modern engines, not Italian lumps from the 1970's.

 

And is it not 1L/1000KM, so a fair bit more than 1L/1000mi?

[davey_83]

7 hours ago, Flashback said:

So if the manufacturer states up to 1l per 1000 miles why do people get so worried if they get to that consumption level? It's not really excessive of Nissan say that's quite normal.

Manufactures state that to safeguard themselves I think, probably something drawn up 400yrs ago and never amended just like braking distances in the highway code LOL

[Flashback]

57 minutes ago, davey_83 said:

Manufactures state that to safeguard themselves I think, probably something drawn up 400yrs ago and never amended just like braking distances in the highway code LOL

Well we do still measure in horse power, so you might be right. 

[davey_83]