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YOUR RESEARCHRacing 76 engine oil & the RMS problem
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Inspect rms during its anual service
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Performed · outcome unconfirmed · Original poster
My independent inspected my RMS during its anual service.
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Performed · outcome unconfirmed · Original poster
(I also replaced my discs and pads myself a few weeks back).
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I have used the 76 synthetic oil but only in high performance aircooled VW engines.
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Performed · outcome unconfirmed · Original poster
I am interested to hear from anyone that has used Racing 76 engine oils or opinions for that matter (
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Suggestion · Original poster
He said he would replace the seal if I really wanted it done but he didnt think it needed to be replaced.
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My independent inspected my RMS during its anual service. I was expecting to have my 8th replaced. Anyway they said that it isnt exactly leaking but rather just weeping now with just a smear of oil on the bell housing. So they didnt want to replace it and told me just forget about it now. But I have already taken this approach......hence the lack of complaining you used to get from me
However they said that the problem I am having is probably due to the oil I am using. I change my oil every 5000 miles and as they said it can only be a good thing......they change their engine oil after every race on their cup cars. But he said that Mobile 0W40 is just too thin. He said that I be using "Racing 76 fully synthetic 5W-40 or even 20W-40 oil". Said he feels certain that any RMS problem would go away if using this oil. He said he would replace the seal if I really wanted it done but he didnt think it needed to be replaced. ANyway after 12,760 miles, my anual (minor) service cost me only £129 but that's cos I do my own oil changes. (I also replaced my discs and pads myself a few weeks back). So, I am quite please about this.
In effect he said oil behind the Rear Main Seal is under (low) crank pressure and not engine pressure as everyone is led to believe. The oil behind the seal is not held in any oil cache or sump. It's simply oil that is passed by the main bearing as it travels through the engine to the sump. But oils that are too thin will get through the seal. Also he said that the seal itself is NOT a precision made part. It's simply a moulded unit and because of this some are better than others in regards to their true tollerance. Because of this some will leak. But a thicker oil will prevent this and he suggested that Racing 76 oil is the best that's out there,
I am interested to hear from anyone that has used Racing 76 engine oils or opinions for that matter (
http://www.southernperformancecentre.co.uk/index_files/Page338.htm
)
I agree with your indy. There is a lot of oil spraying around in the crankcase, but the case isn't under any real pressure, so there is no real differential pressure across the F&R MS's. Lip seals like this couldn't stand it anyway. I use 5W-40 (Texaco Havoline Fully Synthetic) and haven't had any problems - and change it every 6000 (it keeps the service intervals tidy). I think the main reason that Porsche recommend Mobil 1 is the ever-longer service intervals, and a fully synthetic will maintain its properties longer than a semi. Interestingly (for anoraks like me) the Approved Oils list from Porsche only features about three 0W-40 oils, the other 60-odd are 5W-xx. Also, I noticed that good old Castrol Magnatec 5W-40 (semi-synthetic) has crept back on the list. This seems to be the oil of choice of quite a few independents.
Maurice,
It is dated July 2005, which I believe is the latest. They seem to issue one every year. If you would like a copy, email me and I'll attach it to a reply
Hi all,
I have used the 76 synthetic oil but only in high performance aircooled VW engines. A lot of the drag racers swear by it but that might just be down to the cool tire up of 76 and drag racing.
Hi Richard, could you email me the oil list, that woudl be cool.
Cheers
Mav
Here is the PCNA list dated July, 28, 2005.
http://home.jps.net/~mjlopez/images/Oils%20approved%20ALL%207-28-05.pdf
It is the most recent list for our market.
The "thickest" approved oil I remember over the last 7 years was Mobil 1 15W-50, but it went off the list several years ago.
The cars still leaked back then with this "thick" weight oil....
