Which Engine Oil?

[Kenyon]

I always find the oil, plugs, tyres threads interesting. You can at least have a read and take a view.

In fact I followed one, think it was 356 Registry and someone was talking about Marvel Mystery Oil. Seems to be useful all sorts of engine ailments. Anyone used this? I'm not just going to throw it in for no reason but its definitely a catchy name!!

Phil.

[Ashley James]

I’d trust Porsche’s recommendations and I’m sure their Classic oil is fine, but for me there’s that little niggle because a fully synthetic oil will be better still. When BMW tested an early 328 for a million miles in the seventies, they announced that Mobil 1 virtually eliminated wear and Rolls-Roys said the same of Esso Ultron. Porsche put Mobil in my Boxster.

Here’s Mobil’s take on the 10w60 I use in the Healey and the 356C

https://www.mobil.com/English-GB/Passen ... il-1-10W60

[neilbardsley]

I’d trust Porsche’s recommendations and I’m sure their Classic oil is fine, but for me there’s that little niggle because a fully synthetic oil will be better still. When BMW tested an early 328 for a million miles in the seventies, they announced that Mobil 1 virtually eliminated wear and Rolls-Roys said the same of Esso Ultron. Porsche put Mobil in my Boxster.

Here’s Mobil’s take on the 10w60 I use in the Healey and the 356C

https://www.mobil.com/English-GB/Passen ... il-1-10W60

What looks like a good oil too. After I've finished the 20l of the stuff I bought already I may try it.

[Ashley James]

All these discussions are really just opinion.all you can say with certainty is that a fully synthetic oil formulated for the same job as a mineral equivalent will perform better and might extend engine life, by pass oil and air filters permitting.

[neilbardsley]

All these discussions are really just opinion.all you can say with certainty is that a fully synthetic oil formulated for the same job as a mineral equivalent will perform better and might extend engine life, by pass oil and air filters permitting.

I will wonder how I can as a DIYer measure the performance of an oil. The only think that I could think of was to try to weight the fur on my magnetic after each oil change. I'm not sure that I can do that practically but ...

[Bootsy]

I'd just pick one you're happy with and drive

[mycar]

Sage advice indeed.

And more sage advice from the 356 Drivers Manual...

Always use the same brand of oil as was already in the engine. If this is not possible, the engine must be flushed with the new brand before filling.

[neilbardsley]

Sage advice indeed.

And more sage advice from the 356 Drivers Manual...

Always use the same brand of oil as was already in the engine. If this is not possible, the engine must be flushed with the new brand before filling.

That is your first useful post on this thread!!

[Ashley James]

Yet Mobil 1 say you can switch from mineral to synthetic or top up if you have to without worry. Most of us probably have over time.

[mycar]

Sage advice indeed.

And more sage advice from the 356 Drivers Manual...

Always use the same brand of oil as was already in the engine. If this is not possible, the engine must be flushed with the new brand before filling.

That is your first useful post on this thread!!

Don't bother me now Neil, I'm weighing the fur on my magnet as per your recommendation.

[neilbardsley]

[Don't bother me now Neil, I'm weighing the fur on my magnet as per your recommendation.

You could try to weight the fur on his chin instead!

[anglophone1]

I’ve been running this for the last 18 months https://millersoilsireland.ie/cfs-10w60-nt/
No mentions here?
C

[356Monkey]

Million thanks to all of you, I thought I might get a few answers but seems it's a bigger topic that I'd imagined. I was keen to get it right as my engine cost a 5 figure sum to rebuild (which is not unusual) so I'm keen to minimise wear. as I spoke to Paul at PRS as they built my engine (which is fabulous) and as per Mikes advice he favours Valvoline so I've gone for that. I certainly agree that regular changes are money well spent.

Feel free to add any more thoughts - and thanks Mike for getting stuck in to the thread.

[Lightweight_911]

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It's always a good idea to use the oil recommended by your engine builder ...

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[bjmullan]

Well based on the comment from Ashley and looking at the Mobil 1 information I have taken the plunge and just changed the oil in my 911 for Mobil 1 10W60 full synthetic oil. I will let you know if it all ends up on the garage floor. If it does you are in trouble Ashley