Best engine oil for the RX8 231?

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plas87
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Best engine oil for the RX8 231?

Post by plas87 »

I know this topic has been beaten to death, and it seems the general consensus is to use any semi-syn 10w40 oil.

I came across this oil today, Millers Oils CRO 10w-40 Competition Running In Mineral Engine Oil - 5 Litres:

https://www.opieoils.co.uk/p-115257-mil ... e-oil.aspx

For around £25 including P&P it seems like a pretty good deal (once you use the 10% discount code). Has anyone used this so called 'competition' mineral oil by millers? Does anyone here use mineral oil to lubricate their engine or do most use semi-synthetic?
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Re: Best engine oil for the RX8 231?

Post by warpc0il »

plas87 wrote:
Sun Aug 05, 2018 12:57 pm
this topic has been beaten to death,
Correct
viewtopic.php?f=25&t=50814
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Re: Best engine oil for the RX8 231?

Post by goodeggbob »

hi there,i was encouraged to use millers trident by the chap who rebuilt and warranted my engine,thats good enough for me.
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Re: Best engine oil for the RX8 231?

Post by PeteH »

You do know that's running in oil? It's meant to be cheap because you can only use it for a few hundred miles.....
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Re: Best engine oil for the RX8 231?

Post by ChrisHolmes »

PeteH wrote:
Sun Aug 05, 2018 4:52 pm
You do know that's running in oil? It's meant to be cheap because you can only use it for a few hundred miles.....
Minimal if any friction reducing additives or cleaning agents so precisely as Pete says above not for "normal" use
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Re: Best engine oil for the RX8 231?

Post by njkmr »

Comma x flow is what my car has and compression is good.
Very emotive question though and everyone has a different opinion.
I just kept with what previous owner used.
I do premix as well.
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Re: Best engine oil for the RX8 231?

Post by warpc0il »

I thought Millers Trident was now a brand rather than just the single product.

As such, there are products within the brand which are suitable and many more that aren't.

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Re: Best engine oil for the RX8 231?

Post by kopite72 »

I've been using millers 10/40 SS for almost four years now with zero issues. Some specialists recommend it
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Re: Best engine oil for the RX8 231?

Post by acegeezer »

Yep, they do Ian and the latest is 'Millers Nanodrive EE 10/40' I believe RR use this now and Bigpete certainly does.. and so does my car :lol:
https://www.opieoils.co.uk/pv-97943-mil ... e-oil.aspx
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Re: Best engine oil for the RX8 231?

Post by Dazza44 »

same as above millers nano drive been using it since my rebuild and from bigpete recommendation

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Re: Best engine oil for the RX8 231?

Post by AutoGibbon »

I could have sworn the nano drive was a full synthetic and that's why I never bought it.
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Re: Best engine oil for the RX8 231?

Post by acegeezer »

Nope.. semi synth Andrew :thumleft:
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Re: Best engine oil for the RX8 231?

Post by 13Black »

Depends which one you buy. Some of it is fully synth, like the CFS 10w50 NT+ like what I'm running atm.


Also there are many debates on which oil is the best.

None of which have that running-in oil in them.
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Re: Best engine oil for the RX8 231?

Post by goodeggbob »

which running in oil would that be?
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Re: Best engine oil for the RX8 231?

Post by 13Black »

Literally first post.
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Re: Best engine oil for the RX8 231?

Post by geofftl1000r »

acegeezer wrote:
Mon Aug 06, 2018 1:01 pm
Yep, they do Ian and the latest is 'Millers Nanodrive EE 10/40' I believe RR use this now and Bigpete certainly does.. and so does my car :lol:
https://www.opieoils.co.uk/pv-97943-mil ... e-oil.aspx
They list 2 types of 25L drums, anyone know what the difference is?

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Re: Best engine oil for the RX8 231?

Post by RobinPZ72 »

Is there a link on this forum for lubrication requirements e.g. Synthetic & Mineral?
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Re: Best engine oil for the RX8 231?

Post by Dazza44 »

/www.rx8ownersclub.co.uk/forum/viewtopic ... are_type=t

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Re: Best engine oil for the RX8 231?

Post by mi60o0 »

Guys thanks I will try this nano I was using millers trident one the blue bottle before. Never sow this nano think top peeps
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Re: Best engine oil for the RX8 231?

Post by RobinPZ72 »

Cheers Dazza44!

I wonder who's right!

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Re: Best engine oil for the RX8 231?

Post by Freeman38 »

Always have run Miller's oils in my cars for the last 20 years and always the competition oils. In the RX8 5w40 CFS NT. 10w50 in my opinion would be too thick when hot unless turbocharged and there was more heat to deal with.
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Re: Best engine oil for the RX8 231?

Post by 13Black »

The Millers 10w50 CFS NT is listed as being a suitable replacement for when you would otherwise run 10w40 ... for, reasons.
It's the weight that RRevs stock so I'd assume that this particular oil is okay for our applications.
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Re: Best engine oil for the RX8 231?

Post by RobinPZ72 »

Shell helix 5hx 15w/40 mineral for me as the car seems to like it and is changed 3rd month even if it's hardly used! Use protect R in the tank too! Had anyone used the redline race 2 stoke?

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Re: Best engine oil for the RX8 231?

Post by Hopkins »

To quote the Oil 101 thread which I just read again:
Premixing can marginally lower the octane rating of the petrol in your tank. If you choose to premix you should seriously consider using a premium unleaded if you do not already - this will ensure your mix is as knock-resistant as possible, and the PCM can theoretically advance the ignition timing further for a better burn.
I note the word "theoretically" however, from reading these forums, I thought it is simply not done in the RX-8 because the benefits are minor for this particular engine but the effect of knock severe. Is this correct?
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Re: Best engine oil for the RX8 231?

Post by 13Black »

I would contest ANY auto ignition advancing that happens with our PCMs, deviating from the set ignition map that is.

Our seals are far too exposed and fragile to get anywhere near where knock would occur. The ignition is set quite safe, and there it stays.

The cars can't detect what quality of fuel is sloshing around its tank to work out what to set the ignition to.

To rely on the knock sensor would pretty much be too late.
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