What engine oil do you use?

1986 2.5 n/a diesel.

There's a lot to choose from:
https://bearmach.com/catalogsearch/result/?q=Engine+oil

I'm planning to order new oil, oil filter, fuel filter and air filter.

I used/am using semi syn 10/40 in my nad/200tdi.

20/50, because I've still got about 50 galls left over from my Series days.

Whatever's on offer at the supermarket/Lidl/Aldi/Halfords etc ... I change it often enough not to worry about it. It's what we did when racing sidecars and never had an engine problem ..

Think at the moment it has 10/40 in it ... but I've also gone as low as 5/30 ... I also use a little veg oil in the diesel tank and an odd shot of 2 stroke, which are claimed to help clean the engine and improve combustion, and I know there's barely any carbon deposits in the engine (had it apart a while ago) and the oil doesn't blacken so quickly.

Paul D said:

Whatever's on offer at the supermarket/Lidl/Aldi/Halfords etc ... I change it often enough not to worry about it. It's what we did when racing sidecars and never had an engine problem ..

Think at the moment it has 10/40 in it ... but I've also gone as low as 5/30 ... I also use a little veg oil in the diesel tank and an odd shot of 2 stroke, which are claimed to help clean the engine and improve combustion, and I know there's barely any carbon deposits in the engine (had it apart a while ago) and the oil doesn't blacken so quickly.

Click to expand...

I think that is about right. Get the cheapest if you are changing it at low intervals. The 5/30 is probably actually quite good in Northern UK winter temperatures.

Instead of the 2 stroke oil, try the odd shot of Eco Max, or Comma Injector cleaner, I have had good results with both on older diesels, and they are fairly inexpensive, especially the Comma stuff.

Turboman said:

try the odd shot of Eco Max, or Comma Injector cleaner

Click to expand...

Turboman said:

2 stroke oil, try the odd shot of Eco Max, or Comma Injector cleaner

Click to expand...

Interesting - valid for a 300tdi? How much two stroke then?

Turktowner said:

Interesting - valid for a 300tdi? How much two stroke then?

Click to expand...

Personally, I wouldn't use 2 stroke. I have drained several tanks where people have done this, and found pools of the 2 stroke oil, undissolved in the bottom of the tank.
I rationalise this as it not being designed to dissolve in diesel, but in petrol, which is a more volatile fuel.

@Turboman
Fair enough. I thought these additives were a load of bunkem though. I use premium diesel already (I'm sure she doesn't like supermarket diesel )

Turktowner said:

@Turboman
Fair enough. I thought these additives were a load of bunkem though. I use premium diesel already (I'm sure she doesn't like supermarket diesel )

Click to expand...

Not found it to be the case, although there is probably less advantage using them in modern engines, which are designed to use modern fuel.
Eco Max is good stuff, it contains a lubricity additive to give older fuel pumps an easier life, and boosts cetane rating, and cleans the injector system a bit, similar to veg oil.
The Comma injector cleaner is just thin fractions, similar to petrol, but should be formulated not to attack seals in the Injector Pump. It is also dirt cheap.

I think the premium diesel basically contains the additives already, but it is very expensive.

Turboman said:

I think that is about right. Get the cheapest if you are changing it at low intervals. The 5/30 is probably actually quite good in Northern UK winter temperatures.

Instead of the 2 stroke oil, try the odd shot of Eco Max, or Comma Injector cleaner, I have had good results with both on older diesels, and they are fairly inexpensive, especially the Comma stuff.

Click to expand...

Yeah, I rate Comma stuff ... especially when you can get it at heavily reduced prices ..

Paul D said:

Yeah, I rate Comma stuff ... especially when you can get it at heavily reduced prices ..

Click to expand...

Very good for oils, and all kinds of car stuff. Been using Comma for over 30 years, never had any probs with it.