Best engine oil for 4.0 Speed Six Tuscan?

[Tuscan Six]

All

I know that this topic has been covered elsewhere - but cannot locate string. Have gone through Oil man's string but no joy on SP6. Guidance/direction gratefully received.

The car is on 26k, 9k since rebuild - so run-in.

Thanks

[Tuska]

There are many opinions and i'm not sure any have been said to be completley right or completley wrong. Mine is a 2000 model 4.0L with 24k on the clock. On the advise of my indie mechanic (Brian 'the guru' at TopCats) i use a top quality semi-synthetic. You will find many on here using Mobil 1.

Its hobsons choice.

[alloypearltam]

Just to offer a completely different opinion, the dealer that has completed my 1K service has said that our car is currently running 15/50 and is likely to remain on that oil for the rest of its days.

[Tuscan Six]

Thanks guys. My current thinking is Mobil One 5/40 fully syn

[Tuska]

alloypearltam said:

Just to offer a completely different opinion, the dealer that has completed my 1K service has said that our car is currently running 15/50 and is likely to remain on that oil for the rest of its days.

Isn't 15/50 Mobil 1?

[alloypearltam]

It is some breed of Semi Synthetic Gloop. I think it's got castrol gtx in it.

[justinp1]

I know what you mean about the opieoilman thread, think it went on for about ten pages!

I *believe* his recommendation at the end of all of it was 0w40.

That said however, a more viscous oil will mean that less gets eaten by the engine.

[chris watton]

justinp1 said:

I know what you mean about the opieoilman thread, think it went on for about ten pages! I *believe* his recommendation at the end of all of it was 0w40. That said however, a more viscous oil will mean that less gets eaten by the engine.

Yes, I remember that, and have been told by others who seem to know a lot more than me that, although the S6 will drink more of the thinner 0W-40, it is the best for the engine, overall, and that's what I have been using (Tam now on 20K miles without probs)

[Tuska]

chris watton said:

Yes, I remember that, and have been told by others who seem to know a lot more than me that, although the S6 will drink more of the thinner 0W-40, it is the best for the engine, overall, and that's what I have been using (Tam now on 20K miles without probs)

My indie mechanics view was that the Fully Syn oil got too thin at high temperatures causing a loss of oil pressure.

[unrepentant]

The factory manual recommends Carlube.

So everyone uses................

Mobil 1.

[Chim450]

I use Mobil 1 0w40 in mine, I can't remember the last time I had to top it up.

[350matt]

Al Mellings reccommendation at the Speed six talk was 15W -50 synthetic if possible

With the small amount of lube supplied to the somewhat overloaded top-end you'd want something that might stick to components.

Mobil 1 motorsprt is 15W 50
Std Mobil 1 is 0W 40 and too thin

Matt

[unrepentant]

350matt said:

Mobil 1 motorsprt is 15W 50 Matt

Yep. that's what I use.

[justinp1]

unrepentant said:

350matt said: Mobil 1 motorsprt is 15W 50 Matt Yep. that's what I use.

Ill go with that next time when I get another Tuscan. unrepentants engines never die. He must be doing something right! Oh that and Melling knows his stuff too.

My only concern is that in the depths of last winter, the colder it got, you could literally feel the engine struggle to push through the thickness of the oil at that temperature. I suppose there is a trade off with the better performance of the 15w50 under high stress, compared to the better performance whilst warming up and thus less wear during this time.

>> Edited by justinp1 on Wednesday 19th October 18:36

[engelborghs]

since 6000 miles service :
Castrol TMS motorsport 10w60

koen

[unrepentant]

justinp1 said:

unrepentant said: 350matt said: Mobil 1 motorsprt is 15W 50 Matt Yep. that's what I use. Ill go with that next time when I get another Tuscan. unrepentants engines never die. He must be doing something right!

You know it makes sense.