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I can't get my hands on DT40 in time for the Rennsport Rally - my local distributor went out of business. I found Liquimoloy Leichtlauf 5w-40 at Napa - but this stuff doesn't have molybdenum in the bottle. So I need to add Mos2 or Ceretec, or both together? I'm just confused which additive I should use. Thanks for any help!!
Summit racing carries DT40. If one of their warehouses are near you, you should be able to get it quickly. I get mine from the GA warehouse next day with standard ground shipping.
Switching oils and then going back isn't as good as staying with the same oil as you never get it all out during a change, so both this oil change and the next couple will have different proportions of different oils in them and base stocks of the oil may not be fully compatible.
You might actually be better off running the current DT40 a few extra miles than doing this. I say this because...look at Post # 4 in this thread, which is a 997 UOA summary sheet. https://rennlist.com/forums/997-foru...-analysis.html
The Zinc & Phosporous numbers for those running DT40 by itself are better than the ZDDP numbers of other people running something else and then adding either Ceratec or MoS2. It also doesn't seem to help with the viscosity stability as adding it to Mobil 1 0W-40 for example still has a low viscosity by comparison to the DT40 samples.
I found the following quote appear a bunch of time on various oil company and other sites regarding the Porsche A40 spec.... just Google "Porsche A40 Specification"....
"Miscibility: All engine oils approved by Porsche can be mixed provided they are of the same Porsche oil specification. This means that it is not necessary to flush the engine when the oil is changed if another type of oil is used. However, since everybrand of oil has a specially adapted unique composition, the same brand and type of oil should be used for topping up between oil change intervals if possible."
I found the following quote appear a bunch of time on various oil company and other sites regarding the Porsche A40 spec.... just Google "Porsche A40 Specification"....
"Miscibility: All engine oils approved by Porsche can be mixed provided they are of the same Porsche oil specification. This means that it is not necessary to flush the engine when the oil is changed if another type of oil is used. However, since everybrand of oil has a specially adapted unique composition, the same brand and type of oil should be used for topping up between oil change intervals if possible."
I found the following quote appear a bunch of time on various oil company and other sites regarding the Porsche A40 spec.... just Google "Porsche A40 Specification"....
"Miscibility: All engine oils approved by Porsche can be mixed provided they are of the same Porsche oil specification. This means that it is not necessary to flush the engine when the oil is changed if another type of oil is used. However, since everybrand of oil has a specially adapted unique composition, the same brand and type of oil should be used for topping up between oil change intervals if possible."
Peace
Bruce in Philly
Interesting. However, in this case, the OP has been using Driven DT40, which is not an A40 approved oil, and why when changing to it, a flush with BR30 or BR40 is recommended to flush out as much of the previous oil as possible. If this was my car, I'd either get DT40 expedited from Summit or I'd leave the DT40 that's in the car in there for another 1,000 miles until I returned from the event - that assumes the event isn't really far away and we're talking about putting another 2,000 or 3,000 miles onto the oil that was already close to it's change interval.
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MoS2 or Ceretec? Or Both?
