I've just switched to using 10w-40 magnatec in my lux and I think it's an improvement over the fuchs semi-synth that I was getting from GSF beforehand. I change mine every 6kmiles religiously, but I think a 3k interval would be overkill unless your car's a track slag.

Adam

I use Castrol RS 0w40 fully synthetic in my S2 and Castrol Edge 0w40 fully synthetic in my 924S with no problems. Both start well do not use any oil (more than expected) and do not blow it out through the air box or crank breather. I used to run Magnetec 15w40 semi synthetic in my 924S and it was much noisier at start up and tended to blow a small amount out of the crank breather.

The S2 runs much quieter on start up with the thinner synthetic oil probably due to easier flow to the lifters.

I also noticed both cars have much more stable oil pressures not any higher just more stable even after a long fast run the S2 reads around 5bar above tick over and around 2.5/3.5 below 1500rpm. I change my oil every 6 months including filter and it might work out a bit expensive but in my mind worth it but everyone to their own I suppose.

If your going to want your engine oil changed and then forget about it for 12000 miles and 12 months, have an average mileage (probably 100,000 to 200,000) on the clock and want to be able to do track days, drive it however you want and not worry, I would recommend using something like Mobil 1 Motorsport 15w50

Its expensive, really expensive, I agree.

If you change your own oil, a semi synthetic 10w40 would be ok as long as you change it often (6000 miles or 6 months) Your time is free, so you can afford to change it more often.

If you pay someone to change your oil, it may be worth weighing up the costs and have a decent oil put in there right from the word go and leave it in there for 12 months and 12000 miles.

Its just my opinion and thats all it is, based on experience... You can put crisp'n'dry in as oil if you want and I bet the engine will not blow up right away... but it will

never had problems with high performance mitsu engines all of which are turbo'd and i believe they rev 1000 rpm higher than porsche too.

its like the same old argument with mitsu owners that swear you can't use anything but 0/40 mobil1 because any other oil with knacker the engine....nah this country is too cold for thin oils most cars we deal with or have are pre '95 cars giving them a grand old age and a lot of engine mileage and wear. and lets be fair oils have come a long way since regular hypergrade stuff. 20w/50 is fine for most uses especially in the summer but its also beneficial in the winter too

I think 20-40 may be a bit tooo thick for the 944 with it's big lazy-revving 4-pot though? And I thought that a thicker oil (at cold) would afford the engine less protection at startup i.e. when the majority of wear is supposed to occur?

Adam