0W40 or 5W50??
04-26-2015, 11:04 PM
#46
They use lighter weight to cover the broadest spectrum of temperature ranges (the 0w aids in sub freezing climates), aid in fuel economy (HUGE factor), and provide adequate protection where the car will be used most often (the street!).
If you are not in a climate where the car will be driven in below freezing temperatures, and you intend to drive it hard, or track if, 0w40 is not the "best and only choice".
I would run a 5w40 (which will have higher shear resistance than a 0w40), or a 5w50. If the oil is Porsche approved, at that point you shouldn't have any concerns regarding the composition and durability of the oil.
If you are not in a climate where the car will be driven in below freezing temperatures, and you intend to drive it hard, or track if, 0w40 is not the "best and only choice".
I would run a 5w40 (which will have higher shear resistance than a 0w40), or a 5w50. If the oil is Porsche approved, at that point you shouldn't have any concerns regarding the composition and durability of the oil.
05-31-2015, 02:53 PM
#49
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For the track driven cars, sending your oil into a testing company is wise. Like Blackstone.. Porsche A40 spec has a minimum Viscosity @ 100C of 12.49 cST.. If your engine oil sheers close to that spec, wear increases.. Another fact is, that on a 70F day, 0W and 5W oils are similar in startup viscosity. Where you get concerned is near freezing temps or just above freezing. Porsche ALLOWS for Mobil 5W50 and is recommended in high ambient temps, and HIGH severe duty applications. Drivers Ed events and high speed events push the cars service into this classification.
Note, to add to what jbkonis said>> mixing M1 0W40 and 5W50 at 50/50% is a viable choice for the winter/spring driving season. Basestocks are the same with M1 and additive packages allow us to do this. I am actually running this blended mix right now!
Note, to add to what jbkonis said>> mixing M1 0W40 and 5W50 at 50/50% is a viable choice for the winter/spring driving season. Basestocks are the same with M1 and additive packages allow us to do this. I am actually running this blended mix right now!
06-19-2015, 06:42 PM
#52
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Love these oil threads! I asked the local spec Boxster racers what oil they were running and most are running 50% 0W-40 and 50% 5W-50. This is what one of the dealer mechanics recommends (doesn't hurt that he is also the fastest racer in the area).
03-13-2016, 11:21 PM
#54
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03-14-2016, 03:26 PM
#56
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I may have missed it being posted but in case it hasn't here's the link to the Mobil 1 rebate:
https://apfco.net/secure/R8235W/Home/Intro
https://apfco.net/secure/R8235W/Home/Intro
03-15-2016, 10:19 AM
#57
Where can I find detailed information about different oils? Like their content, shear temperature, etc?
By the way what is the cost of having old oil analysed?
Thanks
By the way what is the cost of having old oil analysed?
Thanks
03-15-2016, 10:38 AM
#58
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05-02-2016, 12:28 PM
#59
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I use Motol X-cess 8100 5W40 not because I wanted a 5W40 instead of a 0W40, but because I preferred the chemical make-up of Motul X-cess 8100 over Mobil 1's offering.
And, it's a factory approved oil. There are many factory approved oils. I really don't think you can go wrong with any of them, in the end it's about which one helps put you mentally at ease, and sleep better at night.
And, it's a factory approved oil. There are many factory approved oils. I really don't think you can go wrong with any of them, in the end it's about which one helps put you mentally at ease, and sleep better at night.
One thing to be aware, with Motul is that you generally have to change the oil more frequently, as it breaks down more quickly than Mobile1
05-02-2016, 06:44 PM
#60
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I tried M1 5W50 in my .1RS a few years back, but saw an increase in oil temps, and since I change oil frequently (~6 track days), I switched back to 5W40 (Motul 8100 Xcess), and have recently just bought their new Ester-based "Sport" line, which is even better for track-day applications.
The Motul Sport is offered in both 5W40 and 5W50....I think this will end up being an excellent choice for track day cars, with better shear protection via the ester base.
Sticking with 5W40 for now, but given the Cayman runs hotter, may try the 5W50 again for more protection.
I wouldn't think twice about using this "Sport" line in a 991 GT3/RS or GT4.
The Motul Sport is offered in both 5W40 and 5W50....I think this will end up being an excellent choice for track day cars, with better shear protection via the ester base.
Sticking with 5W40 for now, but given the Cayman runs hotter, may try the 5W50 again for more protection.
I wouldn't think twice about using this "Sport" line in a 991 GT3/RS or GT4.