Just some info, VW did get back to me via a telephone call, the cars details had already been taken prior to this call.
When i asked "could i use a 'fully' over a 'semi-synthetic' oil, given my Polo model engine type?"
They replied 'yes', and infact highly recommended using it instead of a 'semi', it would certainly increase engine protection, and running.
When i asked, "i have fond out recently that a PR code 'QG1' represents a 'Extended service regime', and that it is not present on the cars 'Data lable', is this also an indicator to which oil should be used?"
There reply to this was 'no', it is present on engine models, purely as an indicator that this type of service interval is allowed, providing the oil type used meeets VW approval specification to conform with it, we still recommended changing the engine oil more regularly if possible, regardless of the way it is used, or it's service PR code value.
When i asked, "There are two VW oil approval specifications in the 'User Manual, VW 500.00 & VW 502.00, does this mean that any oil with these specifications is the engines optimum oil?"
There reply, 'No', and that the new VW oil specifications for my model are VW 501.01 & VW 502.00, these approval codes only give the minimum oil quality that can be used in my engine model i.e if a buget branded oil met this quality, with these specs, then it could be used, but it may not be the best in quality, VW will always recommend using an oil reputed for its high quality, and with VW's approval rating.
When i asked, "would using a fully-synthetic pose any risk to 'Seal' or 'Gasket' damage, as the car was 7 years old, the VW dealer recommendation is Quantum Sytha Sliver 10w-40 for my car, but that i wish to use a viscosity of 5w-40, would this be problem to the engine, oil pressure, or the running of the hydraulic valves?"
There reply to this was, 'No', there is no risk to the engine seals, gaskets, or oil pathways when using a fullysynthetic on your model year, and that if oil leaks where to occure, this would indicate that oil leaking was in occurence before fullysynthetic had been used, all VW vehicles that are not older than 10 years can use a fully-synthetic oil, cars over the 10 year period should look to specific 'user manual' instruction for types and grades for there model. There would also be no problem in using a viscose grade of 5w-40, providing it met with our approval ratings, and that in-fact, using this grade would again be a further positive move to increase protection at cold startup, while maintaining it's hot viscosity value at full engine temperature.
I replied, "does that mean i could therefore consider using a 0w-40 grade fully-synthetic oil for the Polo, without risk?"
....the engine technician consulted for a moment, i assume with a others......
...and came back with, 'Yes' you could also use a 0w-40 viscose grade, VW ratings approved, and this would again give even greater cold-start protection, the lower the 'w' rating the better the flow at ambient lower temperature for starting the engine, the '40' element in oil grade should be maintained i.e not reduced as the oil will still maintain a lubricating viscose structure, at extream high engine temperatures that may occure, it is also considered that using oils with lower 'W' and higher 'hot viscose' values will generally keep an engine fully protected, maintaining oil pressure, but that a narrow grade gap will reduce engine life.
I then asked, "would using a 0w-40 fully-synthetic garde have any effect on the engines noise, especially the tappets and driveetrain?"
His reply to this was, 'Yes' there should be a reduced difference in engine noise, an oil grade of 0w-40 will generally pressurize sooner.
The enquiry was then completed.
I have now decided to give the Motul Ester based Product 8100 E-Tech 0w-40 a go, it has my VW approval specs, so i'll let you know any cncluesions i come to.
regards
