What engine oil to use for a Roadster?

The oil filler cap and the Handbook state different grades!

I notice that Halfords have Mobil 1 at 20% off, it's still expensive, is it worth it?

Phill
Sussex

Phill

See my post from last year:
http://www.talkmorgan.com/ubbthreads.php?ubb=showflat&Main=3005&Number=30224#Post30224

In particular:
Choice of oil is tricky. Morgan recommend 5/40 fully synthetic, but Ford recommend 5/30 FS. Try as I might I couldn't locate a 5/40. They seem to be 0/40 (eg Mobil 1)so I've plumped for Mobil 1 5/30 this time. Of course, being a 4litre can I ended up buying two..........

Next time I might try their top spec oil for Diesels which does come in the right 5/40 grade.

Note that this post relates to the Series One Roadster with the ST220/Jaguar V6. Following that post, I discussed (with a friend who is a specialist in the lubricants field) the merits of using Diesel spec oil of 'the right grade'. He takes the view that 0/40 Mobil 1 is probably best as it's more important to have 'zero' grade oil at startup.

What I have noticed is that the 0/30 is showing higher cold presure, but lower hot pressure than what was in there before, but I don't know what that was..........

In the end good quality oil is good quality, so I'm happy with my choice, but will change to 0/40 next time (June 10).

Phil,
I copied Dave W on this and got my specialist to use a top grade 5/30 fully synthetic Lucas Oil on my 09 service.
The low mileage my car is currently doing this is probably serious overkill, but if you have thoughts of the car lasting for decades it seems worth it.

Thanks Dave, sorry I missed your post, I only looked in maintenance.

I've a 2008 Roadster II, didn't think the engines were very much different between the Series. However, the Oil Filler Cap states SAE 5w20 and the handbook SAE 5w30. So it looks like we'll end up using the same oil!

PS Halfords have Mobil 1 5L at 20% off (March 2010)
Phill
Sussex

Apologies - when I said "What I have noticed is that the 0/30 is showing higher cold pressure, but lower hot pressure than what was in there before, but I don't know what that was.........."

I meant the 5/30 is showing....blah blah blah.

It had been a long day!

I know modern engines are very tolerant of posh thin oil, but as a practiced amateur mechanic, 5/20 seems on the thin side, and I suspect very hot tickover pressure will be affected (lowered). Just my opinion.