H2

Pardon me if I've overlooked this on Rennlist, but on the Landshark 928 discussion group (Australia) they've recently mentioned that, for some 928s, the Synthetic oils may result in premature cam wear. Anyone know more about this?

As an aside, I don't use Mobil 1 in my '85S since one of the valves clacks until it pumps up. For some reason, with RedLine oil this noise is no longer there.

However, if Synth oils are not optimal for 928 cam lubrication, that's something that should be verified.

Harvey

Daniel Dudley

Redline is one of the best oils out there, and is suitable for a 928. If you were running 20/50 Mobil 1, 10/40 Redline is the equivalent. This is also good oil for the aircooleds

Jim bailey - 928 International

Some cams do show more than "normal" wear BUT why is impossible to determine. Nearly all used GT cams do not look very good yet run just fine in the car.

Ed Hughes

I don't think it's as much of a syn issue as it is the lack of the proper composition. There's a Porsche nut chemical engineer who lives around the corner from me, who works for an independant petroleum company, that came over to my house for the 911 motor drop last weekend. We had an insightful discussion on lubricants. His seems to favor going toward semi-syns with the proper additives as the answer. SeanR has some of their 10W/40 blend to try in his S4.

BTW, their customers are industrial clients using lots of different types of equipment, and they sound pretty sophisticated as well in their testing of lubricants in their machinery.

On a British car forum, Redline got one of the few thumbs up, as the old UK cars seem to be very susceptible to the crappy oils on the market, especially after rebuilds.

I'm going to send this thread to him, and see if he can chime in...

Normy

There's a guy in Australia who manages trucks and his job involves maintenance costs. The trucking company he works for does regular oil analysis, and he has managed to work his 928 into the loop.

He reports his findings here in the 928 forum. The trucks don't count, but he tells us all about his 928. His car is driven daily, so keep that in mind. What Doug has discovered is that Delvac, which is sold in the United States as Mobil 1 SUV and TRUCK...needs only to be changed at 10k mile intervals.

Doug BACKS this UP! He posts his own 928's results every few thousand miles, and it is amazing to watch- there is almost NO water, soot, or crap to contend with. Note: this is with DOUG's car driven by DOUG and we surely have no idea if he occasionally takes it out and blows the carbon out of the engine. Total YMMV~

After 20 years and 11 cars, I finally changed from Castrol 20w50 in my cars- based upon Doug Hillary's posts....I put Delvac in my 928 last year. I'm interested in not polluting the planet, so the fact that the same oil could stay there for a while attacted my attention. Well...I've developed a small leak around the filler, where it meets the extended section of the lower oil pan. If I pull the two bolts that hold this down, I'll wind up with a river of Delvac approaching my $8000 paver driveway.

Synthetic oil, such as Delvac, has a reputation for causing leaks. I had a leak from the oil pan from 2003, and the ends of my cams are a bit wet, though hardly worth mentioning. I had no new leaks when I switched from dino Castrol 20W50 over to the new 10W40 Delvac- in fact, the oil pan gasket slowed its leak to the point where it has pretty much quit. I'm planning to epoxy the floor of the garage in Wilton Manors in June or July, and this fact is one of the reasons for the big garage refurbishment.

Anyway, look for Delvac. That and be sure you change your oil only when it needs to be changed.

N~