I had to rebuild my engine in the past because i overheated it.
My dad told me i should add Liqui Moly Oil Additiv (Part Nr. 1012) because that would prevent the engine from blowing up when overheating.

I doubt that but anyway.
Is this true?
Or can this even harm my engine?

PS: As turned out later my engine blew because of a bad radiator we replaced meanwhile.

Edit:

I got a 1971 Oldsmobile Cutlass Supreme with an Olds Rocket 350.

 

There are so many oils out there that are suitable to run without additives.

 

Well i dont believe that adding an additive or using special oil prevents the engine from blowing up when overheating anyway.
Just asking because my dad wants to use it on the car and i want to be sure not to damage anything and to hear some opinions.

 

The moly probably wouldn't hurt the engine, but it also likely would not prevent a catastrophe due to excessive overheating. I once tried it and most of it ended up in the filter. I'd probably just use a quality engine oil of the type for your flat tappets and don't let it overheat even if you have to install an automatic shutdown.

 

x2

An oil additive won't prevent catastrophic engine failure. Just run a quality engine oil and make sure the engine is running properly.

 

Thanks thats what i already thought.
What type of oil would you recommend for the Olds Rocket 350? What is the best?
Would you recommend some specific brands?

 

Michael, everybody has a different recommendation on which brand oil to run. Personally, I run Rotella T4 15W-40 in my Oldsmobiles and my Ford diesel truck because it can be purchased reasonably at Sam's Club and is a heavy duty engine oil. The consensus seems to be that premium grade oils with a high ZDDP content are the best to run. ZDDP protects flat tappet camshafts from pre-mature wear.

 

This ^^^^^^^
I use Valvoline VR-1 Racing oil. Great for flat tappet cams, excellent results, readily available and not that expensive.

Hope this helps.

 

it seams that rotella is not available here in germany.
But Valvoline VR-1 is!!!


https://www.valvoline.com/de-de/our-...oil/vr1-racing

VR1 RACING 5W-50
VR1 RACING 10W-60
VR1 RACING 20W-50

Which one should i buy?

 

Do they have 10W-30? It’s a good thing they don’t have Rotella, it’s not what it used to be.

 

No i cant find VR1 10W-30 here in germany.
They also do not list this on the valvoline website. Maybe they do not sell VR1 10W-30 anymore?

Also found a post saying that olds recommended 10w-30 and 10w-40 back in 1970: https://classicoldsmobile.com/forums...40/#post833906

So VR1 10W-60 wont do it?

 

10w-60 wouldn’t be my first choice. Yes they do still make 10W-30 here, just maybe not there.

 

Are there some good alternatives?
As i understand any high quality 10w-30 or 10w-40 with high ZDDP would do?

Would 10w-40 be even better for regularly fast driving?
Read in a german Forum that Chrysler recommended 10w-40 for the hemi instead of 10w-30 for "racing use".
Of course its not a Hemi but anyway.

 

Don’t know if they have it there but look for Brad Penn or Driven oils as well.

 

I'm sure that there are other people in your area of the world that have old cars. Ask around to see what they are using and do some research. Flat tappet cams were not installed only in American cars.

 

I found this one:
https://www.rektol-klassik.de/produc...API-SE-CC.html
(You can switch to english language if not recognized automatically)

and this one:
https://www.royalpurple.com/product/...eet-motor-oil/

both available here in germany and both have high ZDDP content.
Rektol is available as 10w-30 and pretty affordable.
The Royal Purple is available as 10w-30 and 10w-40 but seams to be synthetic oil.

What is better 10w-30 or 10w-40? does it make a huge difference at all?
What do you think about the Royal Purple which is synthetic oil but with high ZDDP? Its also pretty expensive. (3 times as much as the rektol)

Other than those i did not found a lot but there might be more though.

 

No. Buy whichever oil is readily available. I would but a conventional oil over a synthetic for my Oldsmobile.

That's too bad that Rotella isn't available in Germany, you might look at truck stops and travel centers for Rotella and additional oils. Rotella is marketed to semi-trucks.

 

Well i think i will go with the Rektol 10W-30 because its high quality conventional oil with high ZDDP and specially made for Classic Cars.
Its also readily available at a reasonable price.

 

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