Castrol 5w-40 instead of Mobil 0w-40???
#35
I've been using Castrol 5w-40 for about 4 years now on my 996 C4S, On my 996 tt I ran castrol 5w-50 all summer for track season, doesn't get driven in the winter. 40 will break down to a 30 quickly in hot temps that tracking does. Which is why I go with the 50. Doing 12k km between oil changes or yearly which ever comes first.
#36
i've been using castrol 5w-40 for about 4 years now on my 996 c4s, on my 996 tt i ran castrol 5w-50 all summer for track season, doesn't get driven in the winter. 40 will break down to a 30 quickly in hot temps that tracking does. Which is why i go with the 50. Doing 12k km between oil changes or yearly which ever comes first.
..agreed..
#37
Actually the high zinc content coupled with the phosphate (ZDDP) while risky to converters in that the zinc and the phosphate can sour the converters (form a coating that seals the exhaust gases from the catalytic metals), is also risky to the cam lobes. Too high levels of ZDDP can result in spalling at the cam lobes.
#38
I've been using Castrol 5w-40 for about 4 years now on my 996 C4S, On my 996 tt I ran castrol 5w-50 all summer for track season, doesn't get driven in the winter. 40 will break down to a 30 quickly in hot temps that tracking does. Which is why I go with the 50. Doing 12k km between oil changes or yearly which ever comes first.
#39
To learn more about motor oil, its properties and classification,
I suggest bobistheoilguy.com, for example see
http://www.bobistheoilguy.com/whats-in-your-motor-oil/
I suggest bobistheoilguy.com, for example see
http://www.bobistheoilguy.com/whats-in-your-motor-oil/
#43
I've been running M1 0w40 and go through about a quart every 1000 miles. Based on some conversations I've had with different racers and tuners, I'm thinking of going with Motul next time. I have the stuff in my M Coupe and it's great. It's called 300V LeMans 20W60. Any of you guys have experience with this? The weight for my GT2 would be 300V "Power" 5W40.
Here's a link: http://www.motul.fr/uk/index.html
Here's a link: http://www.motul.fr/uk/index.html
#44
![Smilie](https://www.6speedonline.com/forums/images/smilies/smile.gif)
#45
oil threads are great and this one's old school. for fun, there's a 12 page list of approved oils for our cars at the beginning of this thread in case it was missed. take your pick lol. it's comforting somehow to know that among the 50 or so choices of approved oils i know it's ok to use duckhams 0-40 or even pentosin's in a pinch
if that's all i can ever find. as for me, i happily use a 60/40 mix of 0-40 and 5-40 M1 and it just purrs. i've only heard of that "rattle", but not heard it at 111k miles ![EEK!](https://www.6speedonline.com/forums/images/smilies/eek.gif)
but there's been a screech or two once at startup at 108+ degrees
so that must've been before i added the 5-40
![EEK!](https://www.6speedonline.com/forums/images/smilies/eek.gif)
![EEK!](https://www.6speedonline.com/forums/images/smilies/eek.gif)
but there's been a screech or two once at startup at 108+ degrees
![EEK!](https://www.6speedonline.com/forums/images/smilies/eek.gif)
![Roll Eyes (Sarcastic)](https://www.6speedonline.com/forums/images/smilies/rolleyes.gif)