Mobil 1 - is this the best for my new baby ( '97 993)

[vinceG]

I am due a 12k service for my new ’97 993 C2S – 47k miles and booked her in today for next month at a major independent. I am a long term fan of Mobil 1 in my cars so post review of the PCGB forum thread on this subject elected to go for 0-40w Mobil 1 which seems approved etc. I bought said oil ( 12ltr) last weekend so it's now ready and waiting.


Two questions:


1) Is Mobil 1 not an ideal oil for a 993. When I booked appointment today seemed this was being implied without being said – what views. I want the best for my baby.


2) On viscosity I went for 0-40 but was advised that 10-40 would be a better bet as 0-40 is so thin it may well show gasket leaks not previously seen. Is this so, is 10-40 the right grade. I have checked Porsche approved oils list this on the ‘approved’ oils and Mobil 110-40 and 5-40 are approved but only 10-40 I see is called Mobil Super - I have not seen latter i the usual outlets. I have no leaks now and keen to keep it that way. Am I good with 0-40, being paranoid, or should I put in something else?



Vg

[sportsandclassic]

hi

you will be fine with 0w40 mobil 1.

mike

[Raven Flyer]

The best is between Motul 8100 Ester E-Tech 0W-40 or Silkolene Pro S.

Motul is Porsche approved, not sure if Silkolene is but both are excellent oils and being Ester based, will protect an unused engine for 6 weeks. PAO based oils like Mobil 1 don't have the static properties of Ester oils and the oil will start draining off bores, cams etc as soon as you turn the engine off.

[nel]

Also a fan of Mobil 1, though my car (993 turbo) didn't like the 0W-40. This quickly pinpointed leaks in the cam-cover gaskets (they harden up with age) and I ended up replacing them. I now only use the 5W-40 following that experience....

[AJAX50]

Any thoughts about how to change from a conventional oil to a fully synthetic with a 993. Change both filtres I suppose, but there are still a lot of pipes with oil in. Is an engine running flush through needed? Any ideas or experience?

[triple7]

Its all a load of hype, changing the oil with a normal good quality product every 3000-5000k is better than blowing money on Mobil 1 at each infrequent service.

Use the grade as speciified in the hand book.

G

[stuttgartmetal]

Mobil 1 is £23 in costco thurrock, beat that !

[Geneve]

triple7 said:

Its all a load of hype, changing the oil with a normal good quality product every 3000-5000k is better than blowing money on Mobil 1 at each infrequent service. Use the grade as speciified in the hand book. G

Absolutely correct.

[jpf40]

I use Motul or Silkolene.

If you want your engine to live longer then the above are superior, fact, not hype.

The oil in the handbook will mean using a synthetic anyway so you might as well use the best.

[968ant]

I use mobile 1 every 3- 5000 miles or every 6 months, it costs around £250 per anum which doesn't seem alot to keep the engine tip top.

Ant.

[aceparts_com]

I use 0-40 mobil 1 in the winter (not a drip in sight) and 15-50 in the winter and for track days. Change it 3 - 4 times a year but then it does only cost me £3 a bottle

[cyberface]

If you're not using your car very regularly, then I'd advise using 15-50 Mobil 1 rather than the 0-40 Mobil 1 - IME the 0-40 stuff, being very thin, dribbles down the bores if you leave the car for a week, resulting in a massive cloud of smoke on next startup. The 15-50 isn't as bad in this respect.

Also, if you leave the car for a few weeks, the 0-40 results in the tappet followers running dry and a very alarming noise on startup!!! Not a problem as long as you don't rev it, they fill up within a minute or so.

[Silver993tt]

cyberface said:

If you're not using your car very regularly, then I'd advise using 15-50 Mobil 1 rather than the 0-40 Mobil 1 - IME the 0-40 stuff, being very thin, dribbles down the bores if you leave the car for a week, resulting in a massive cloud of smoke on next startup. The 15-50 isn't as bad in this respect. Also, if you leave the car for a few weeks, the 0-40 results in the tappet followers running dry and a very alarming noise on startup!!! Not a problem as long as you don't rev it, they fill up within a minute or so.

My 993tt was using Mobil 1 0-40 originally and I had no problems. Got it serviced using 15-50 and masses of smoke. Problem was a dodgy porsche oil filter. Changed that and a few start ups later no problem. Took a few starts to clear residual oil that bypassed the bad valve in teh oil filter (small one). This is quite a common problem, often diagnosed as a bad turbo when in fact it costs 10 quid to fix with a new oil filter

[supermono]

cyberface said:

If you're not using your car very regularly, then I'd advise using 15-50 Mobil 1 rather than the 0-40 Mobil 1 - IME the 0-40 stuff, being very thin, dribbles down the bores if you leave the car for a week, resulting in a massive cloud of smoke on next startup. The 15-50 isn't as bad in this respect.

Is this really a problem? Shouldn't you choose an oil based on the protection it gives when you're driving. I'd have thought a cloud of smoke at start up -- even a big one -- is pretty irrelevant isn't it?

SM

[leosayer]

Good oil thread here:
www.pistonheads.co.uk/gassing/topic.asp?h=0&t=124186

[cyberface]

supermono said:

cyberface said: If you're not using your car very regularly, then I'd advise using 15-50 Mobil 1 rather than the 0-40 Mobil 1 - IME the 0-40 stuff, being very thin, dribbles down the bores if you leave the car for a week, resulting in a massive cloud of smoke on next startup. The 15-50 isn't as bad in this respect. Is this really a problem? Shouldn't you choose an oil based on the protection it gives when you're driving. I'd have thought a cloud of smoke at start up -- even a big one -- is pretty irrelevant isn't it? SM

Yes, I suppose so, but my take is that I'd rather have some oil left in the heads when starting it up rather than it all draining out of the top part of the engine. After all the protection when oil pressure is 5 bar is going to be good with either synthetic oil - it's the engine start where the vast majority of damage is caused.

I could be wrong but my experience is that the slightly thicker oil doesn't drain out of the top end as much. It's not a problem if you drive it every day though.

[johnfm]

I just rang my local OPC and asked the service department. THeir answer was:

Mobil 1 synthetic.

I asked, "Which viscosity?"

They said: " just the top spec one....."

Talk about chocolate teapots!

Anyway, I rang Parr and they suggested 0-w40 was recommended for my GT3.

[fulham911club]

vinceG said:

I am due a 12k service for my new ’97 993 C2S

With all the revised talk of 993 v 996 (and 997) why do you want to put such modern oil technology in the car? Shouldn't you be using 10yo oil?

[ballcock]

The OPC I got my car serviced in uses castrol fully syn 40w ... I questioned this but they were adamant that the oil was perfect for the job... Are they trying to save pennies??

[polarexpress]

I use a 75/25 mix of Mobil 1 0W-40 and 15W-50 in my GT3.

No smoke on startup and only 0.5litre topup required in the past 6k miles.