Oil change

[fabulicious]

Will be doing an oil change soon and am looking for some recommendations on which grade/type to go for.
I am not fussy on cold start protection as the car is not used daily therefore was going to go for something that offer's more protection against heat.
Any wise and wonderful suggestions?

[Coops]

10w-40 semi synth seems to be a popular one

think I used 15w-40 semi on the Williams when I had it

[fabulicious]

15w changes less with temperature than a lower index correct?

[Coops]

no, 15w changes more as its thicker at a lower temp than the 10W, they have equal viscosity at 100 degrees (that's the 40 part)

the W represents a scaling factor as well, which is why although the oil is at a higher viscosity when cold than when warm, the number for the operating temp is higher than the W number given.

if that makes any sense!lol!

[fabulicious]

I havent a fookin clue what your on about coops!

So what do i go for. A 5w40 then? 5W30 perhaps?

[Coops]

10w 40 semi will be fine unless you have a worry about tappet noise etc

any thinner and you'll be back on here worried about low oil pressure on cold start lol!

[Yanoo_]

If I were you, I'd use 10w40 (semi-synth) or even more 5w50 full synth oil in my car for daily use (in the UK). In Hungary, where the summer is much hotter, I'm using Mobil 1 5w50 full synth, very good oil.

[Yanoo_]

If I were you, I'd use 10w40 (semi-synth) or even more 5w50 full synth oil in my car for daily use (in the UK). In Hungary, where the summer is much hotter, I'm using Mobil 1 5w50 full synth, very good oil.

Damn edit button, so try it again:

If I were you, I'd use 10w40 (semi-synth) or even more 5w40 full synth

[fabulicious]

Ok thats perfect chaps..wanted a balance between UK and Continent views.
Yanoo I'd say you notice the effect of ambient temps in Hungary a lot more than we do here in the british isles as I did also in Italy.

So 5W40 full synth for high heat ambient locations and 10w40 for all others.
The 5w40 behave well on the motorway? Your not running any coolers are you on the 1?

[Yanoo_]

No, perhaps I was ambigious:

For Renault F7 engine series:
10w40 or 5w40 for colder climate & daily use, or track with oil cooler (Mocal or other proper oil cooler)
5w50 or 10w50 for hotter climate & daily use, or track with oil cooler, or for colder climate & track use without oil cooler
10w60 for hotter climate & track use without oil cooler

The smaller the number before W, the less viscous the oil in the cold.
The higher the number after W, the more viscous the oil at high temperature.