Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Recommended engine oil for a 4/4 engine 1.6 TI VCT

Eddie, my old post you quoted was polemic, of course. I didn't want to offend anyone with it and I hope we don't have any disgruntlement.

On page 292 of the manual see the link below 5W50 for racing is recommended for the Ecoboost. Not for the 5.0 litre on the following pages. But for the Shelby in the other manual also.

This is certainly not recommended without justification. For the Sigma 1.6 there is not such a recommendation by Ford. But I suppose this is because nobody has the idea to do a Ford Fiesta 1.6 trackday. If I take the 4/4 hard, it can not be completely wrong to choose a higher viscosity.

http://www.fordservicecontent.com/Ford_C...-US_09_2017.pdf

I am wondering which oil e.g. Lawrie used when they had the racing Sigma even it is not comparable with the standard engine.

Joining this very late. I have a 2017 4/4 Sigma 1.6 and the handbook that came with it clearly suggests the following oil options:
SAE 5W30 semi synthetic
SAE 4W40 fully synthetic
SAE 5W40 Mineral oil

I believe the Sigma engine that Morgan use may not be a standard Sigma ( the label on the engine under "special equipment" states" Power Torque Order E4371- FCS Quote 2016-2295").
Would be interested in people's thoughts

Don't use the last (basic) one or you may screw the CAT

Forgetting the pros and cons as to the grades and types of oil to use for a minute I would like to remind those looking for an oil that will survive long service intervals that the products of combustion and wear fouling the innards of your engine can significantly reduce engine life. Consider changing oil in half the time recommended in your manual and that by doing this you can double the life expectancy of your engine.

Yep fully agree with cooper man re the mineral oil. These are modern engines and fully synthetic is the way to go here!

4w-40 well I have no knowledge of that as a grade... So let's look at 5w-30 and 5w-40. First number is a winter rating or a cold rating temperature and the second number is for hot temperatures. Basic advice is don't mess with the first rating or W number. This is the lightest oil viscosity your engine can maintain mechanical separation, ie. prevent metal to metal wear contact.
Now to the second number. Ford would have a small turbo in most of these engines and would run as standard 5W-30 in order to successfully lube the turbo, Well there's more to it than just that, and it's all a compromise! So how hard do you drive your car? If you race it and always run hot I'd suggest you use 5W-40 as this second grade will give you greater component separation when hot over the 30 grade. The oil manufacturers would tell you this.... In Europe where temperatures rarely exceed 30'c 5w-30 would be the oil of choice in hotter climes use 5W-40. So generally for the cooking version of your engine 5W-30 is fine but you probably will run hot from time to time and you have no turbo to consider with small oil ways so I would go with 5W-40 and in fact I do.... it will protect your engine more! The next thing is to change your oil way sooner than any car manufacturer would suggest.... it is the cheapest repair bill you will have! When I hear you ask! Well again it depends on use... track your car, come home and change your oil.... use it hard on the roads and start thinking 3500 mls, no more than 5000 mls and if you don't exceed that annually then change it once a year, at the end of the season rather than at the beginning so nothing toxic sits in there over winter! And please... don't believe those who tell you that at low mileages you don't need to change the filter every year! Yes you do! Never use a cheap filter they are not the same. Fortunately, Fomoco are excellent quality and K+N are good too! and what's a tenner to protect your engine?

I use a millers product, It's 5W 40 CFS nano ++. It's the best oil at the best price you will find, all the racing boys use it And I can assure you, you will notice a real difference! People will tell you that 5W-30 offers less resistance within the engine and you will feel that in acceleration.... total tosh and a performance oil like I have suggested with nano technology is way superior.


A note of caution here for those running older cars with say TR tech engines or older. You really are better sticking with a traditional 20/50 oil being semi synthetic or fully synthetic as they are designed to clean older engines and keep them clean. They will never have an oil change limit of more than 5000 mls or generally 6 months in time.