Thread: 5W-40 oil

Been running penrite 5w40 full synthetic in my D3 for over 150,000km changed at either 10k intervals or 6 months.. usually the 6 months is up before the 10k.

Bulletman

Have you checked what Ford USA recommend?

Changing the oil wont increase its lubrication properties.
As long as your lubrication system is up to scratch running the 30 wt oil isn’t going to do your engine any harm.

If your bearings are slopping around, clearances all worn out, pump down on flow (and therefore reduced system pressure) etc then you may have problems.

If your engine is well maintained, then 5w30 won’t do it any harm.

If your engine is 200,000+ km and those clearances are opening, then a 40 wt might be of benefit.

Well given I'm at 140k now I might go to 5w-40 particularly in light of the low oil pressure these things run at

Originally Posted by Meccles

Well given I'm at 140k now I might go to 5w-40 particularly in light of the low oil pressure these things run at

I’m at 193k and no intention of shifting.

I am at 230,000km and still on the specified oil. Having read most of the threads on AULRO and the UK forums on this, I see nothing from "qualified" experts to change my mind - lots of views from 'experts in their own minds'.

One thing about Christian is he never proclaims himself to be an "expert". In fact he goes to some length to point out that he isn't, he's an electrician and a hobby YouTuber. However, he has done something that most of his detractors have not; he has rebuilt more than one of the things. He formed his opinions on the 5W30 based on research and observation, and not prejudice. Also, he is willing to alter his opinions based on new evidence.

The first engine I saw him strip had quite clearly suffered an oil starvation event which spun the bearings. On an engine as stressed as these are, it only takes seconds. Pretty easy to form an opinion on the oil used based on that, along with the different recommendations in different countries. Is he right? Well, I'd say he has more info than many here simply because he has done it.

The last one he did obviously didn't have a servicing issue, and I really hope he comes back with a metallurgical report on that crank, because it was clearly not an oil supply issue, as the bearings were perfect.

One of the points he has made many times in his vids is that there are many, many of these engines out there with high mileage that haven't broken. I would add one word to that: yet. The fact that individual engines mentioned here have reached around 200,000 Km without failure does not mean they're immune.

I hope everyone continues to enjoy their cars, because the things are incredible.

Originally Posted by Tins

The first engine I saw him strip had quite clearly suffered an oil starvation event which spun the bearings. On an engine as stressed as these are, it only takes seconds. Pretty easy to form an opinion on the oil used based on that, along with the different recommendations in different countries. Is he right? Well, I'd say he has more info than many here simply because he has done it.

How does one know after the fact which one occurred first? A spun bearing can cause oil starvation and vice versa. Once the secondary damage of the initial failure is done it gets tricking finding the actual cause. I personally think that its actually a case of spun bearing first, but that's just my opinion.