What is the best Oil to use in a Rotary Engine?

[Gewdraa]

Interesting, there are many benifits in using a synthetic oil, low viscosity, helps engine cranking, additives etc, longerlife of oil,
Here is an interesting faq
http://www.royalpurpleconsumer.com/reso ... ry-engine/
Anyway I shall keep searching for information

[Gewdraa]

If anybody is interested here is a nice oil comparison tool, its free,
Really shows the advances in oil over the years.

https://www.lubrizol.com/EngineOilAddit ... fault.html

the valvoline race oil specs are as follows
SAE 20W-50
API SL
ACEA A3/B4
Ford M2C-153E
GM 6094M

so any acea A3/B4 meets these specs,

[Gewdraa]

Read this
http://www.racingbeat.com/mazda/perform ... -oils.html
Hmm

[spoddy]

Mazda always recommended castrol oil.

rx8's comment don't count here.

Oh I know they don't so didn't mention the 5w30 magnatech I use. Just re-irrerating what Tool and few others have said that Mazda recommended castrol engine oils and for their diff oils etc. I have heard of royal purple in the states being used.

[Gewdraa]

Seing as we dont now the history of engine we are going to install, I shall recommend mineral oil, but if this was a new build I would be putting synthetic in it,
Points noted about seals and carbon deposits.
We have three engines, the best compresson one is going In

[Gewdraa]

interesting site about oil specification
http://www.carbibles.com/engineoil_bible.html

Castrol recommends Magnatec 10W-40 A3/B4

[TOOL]

Peanut oil

[hoodedreeper]

Just read through this topic and i'm still indecisive to which oil to use.

As far as i'm aware the car still has the OMP,so do i go with 10w30 mineral,20w50 mineral or Castrol 15w40 semi?

[A7RXY]

I've used Castrol Magnatec 10W40 or its predecessor for the last 30 years in mine and it's still running ok.

Dibs

[TOOL]

My intended next oil purchase:

http://m.ebay.co.uk/itm/370546840579

It's the right grade. It's the right weight for our climate. It's cheap as you need to change it regularly. Even more so on a BP due to fuel contamination of the oil.

£2.25 a litre

I use the same brand (but right spec for the car LL04) in my diesel BMW.