JET951

Hi Doug , I must admit it gets confusing / contradictory when you say in post no 14 .

" Many newer "AW" anti wear and other chemicals are out performing high levels of Phos /Zinc ".

But on the very same day on the Boxter& Boxter S (986) forum , Heading = oil help needeed , post number 12 you state and recommend two Diesel oils that are very high in ZDDP and detergents and most remarkably do not meet the recommendation by either Porsche or Mobil for the use in flat six water cooled Porsche cars that run on gasoline/petrol.

WHY ???
Regards .BB.

Doug Hillary

Hi,
I will not be replying to JET951's Post but for those interested this Link explains why:

http://928.landsharkoz.com/Forums/ta...c/Default.aspx

jcorenman

This member thinks that would be a terrific idea. I've read your posts on various boards over the years and very much appreciate your insights into a confusing topic. Knowing the expected ranges for these engines would be very helpful.

Your point on obtaining a VOA is also well-taken, without that baseline it is hard to know what is supposed to be there and what is not.

Thanks!!

stuartph

Doug


Thank you for looking at my report

Does the level of tin and alloy indicate a problem, the engine has done 151000 miles so its been around

The inlet manifold has been off for powder coating and so were the cam covers, is the level of silicone a problem ?

I used the oillab.co.uk, do you know of any others in the UK

Thanks

Doug Hillary

Hi,
stuartph - Thanks for the extra information

Firstly new lubricants can have a high silicon content - that is another reason why a VOA can be useful

In light of you doing the work you indicate it is likely that the silicon-silicate content came from this. If sand blasting was used then this is probably the prime reason - it is hard to get the parts free of debris. Silicon based sealants can also raise the level in the lubricant too depending of course if they are in contact with it

I think the wear metal levels are OK but I would carry out the OC and UOA plan indicated earlier

I don't know of the Lab you used - Oil Company Labs are the best - especially if they produce the lubricant as they are then up to date with formulation tweaks!

UOAs cannot predict a sudden failure and it is only by trending your own or comparing within an engine family that a reasonable wear pattern can be obtained. UOAs are excellent however for establishing the condition of the lubricant

Is the lubricant Motul V300 15W-50? - the UOA's viscosity confounds me a bit as it may suggest some dilution via fuel or a lighter lubricant

stuartph

Doug

Yes you are correct it is the motul v300 15w50, one of the reason's i choose it was because it could take a high amount of fuel dilution with running the stage 3 SC


Thanks

CanAmJohn

You can send a sample to Mike Fenton in the technical department at Millers Oils in Brighouse. Tel 01484 713201. They will supply you with a bar graph representation of the oil sample with recommendations based on the sample results.

I use them all the time for checking our V8 race engine oil samples and have sent them Castrol as well as Millers oils, which they have been happy to check for me. They have never charged me for this service.

I use Millers CFS 10W/60 oil in our high stress big block and small block chevies, the 9 litre big block in particular suffers from fuel dilution because it's running Kinsler high pressure mechanical injection with fairly large ring gaps, plus the block is acting as a stressed chassis member so sees some twist in the corners, it's pushing 820BHP and 800lbft.

The CFS range from Millers is ester 3 based, as is the Motul you are using. When i manage to buy a 928 I'm going to try their oils, i'll check with them first which they think is best for the 928 engine. Their oils certainly stands up to some serious loading and survived with no problems when the car ran for 3 hours with 140 degree C oil temp when we raced in Johannesburg this year in high heat with the coolers not working as hoped due to the high altitude.

I've also used this oil in 650BHP+ 2.4 litre turbo Subaru's and as long as you stop any oil surge it protects the bearings amazingly well, if you've seen the size of the bearings in a Subaru flat four you will be gobsmacked they can take that kind of load, they are tiny.

I've been very happy with the service and the oils they produce.

slate blue

Millers oils had a write up in Race Engine Technology, about half of it went over my head but they certainly seem to be in the big league, I would hate to think how much their oils cost.

Greg

CanAmJohn

I pay around £40 (AUS$87) per 5 litre, so US$60 per 5.2 quart. It's cheaper than Motul.

stuartph

Thanks John

I'll get a sample tested by them, as i wasnt that happy with the company i used for this test and a 2nd view cant be a bad thing.

Oil surge wont be a problem as i have a drysump going on the car at the moment.

I asked guy at opieoils if my choice of oil was correct for my car and its use and he said it was fine

CanAmJohn

The oil you are using is excellent Stuart, I've used it myself for a long time in turbo engines, it smells nice too.

I've had good results with Castrol RS 10W/60 too, they call it Castrol Edge Sport 10W/60 these days. There are two blends of this oil, one is designed for the BMW M3/M5 engine that had the problems with the Nikasil lined bores, that used to be called Castrol TWS 10W/60, that is now rebadged as Castrol Edge 10W/60, the normal version of the oil which would be good with an alusil or conventional bore is called Castrol Edge Sport 10W/60.

The dry sump system sounds interesting, you are using this hard on circuit then? Have you tried the baffled sump kit that Paul Anderson sells now?

stuartph

John

I know of the baffle kit yes but it wasnt enough for me, yes i will be spanking the car very hard on as many tracks as possible next year.

CanAmJohn

You cant beat a dry sumped system for engine protection, that's for certain. I expect the baffled sump kit will work OK for me though as I'm not going to use any sticky tyres on the car, it will be 95% road use with a couple of trips to the nurburgring a year all being well.

Cheburator

It would be great to see what the baffled sump does at the Nurburgring. The Ring will put a lot of pressure on the oil control system. There are 4 or 5 corners - both left and right handers - where stock engined 928s on race suspension, but street tyres see pressure drops from 5bar+ to 3.5bar.

I tested my dry-sump system at the Ring in October and was more than happy with the results - no pressure drops and no more oil consumption. Stuart's system should work well - after all it was made by drnick and myself

Alex

mark kibort

Not if you use Amsoil! . I'm on race rubber and 100mph turns (160km/h) do nothing to oil pressure, as it stays right at 5bar. However, this was not the case when using Mobil 1 a while ago. no scrapper, acusump or fancy breathing system and this is after 110 race days! (on the holbert engine and about another 80 race days on the 84 5 liter before that)

mk