Oil...

[ruan9n]

VW specifies castrol 5w40 fully synthetic for my car and I have been using this oil in all the turbo cars I have owned for years now. Recently I tried shell helix hx7 10w40 and could not really notice any difference in how the car ran. I have seen Porsche specifies Mobil one 0w40 for all their cars and more improtantly I saw a quart in the luggage compartment of a 996 turbo. 10w40 is thicker than 5w40 and 5w40 is thicker than 0w40? Why is it that Porsche would specify a "thinner" oil for their turbo model than VW does?

[katotter]

I used to put 10w60 FS in my car (non spec) and ever since I started using 5w40 FS I seen better fuel consumption, car pulls better, cold mornings heats up faster etc...

[PoLonY]

0W40 is only thinner then 5W40 at colder temps, at operating temps they are equal in viscosity

[katotter]

0W40 is only thinner then 5W40 at colder temps, at operating temps they are equal in viscosity

What difference does the viscosity make then, as I assume that the real 'job' is done at operating temps?

[Naku786]

http://www.bobistheoilguy.com/putting-t ... viscosity/

http://www.bobistheoilguy.com/motor-oil-101/

[Neuk]

0W40 is only thinner then 5W40 at colder temps, at operating temps they are equal in viscosity

Bingo Roadhawg can explain the ins and outs of oils, he has done a few courses and sells the stuff...

[Naku786]

Where is Miela, he is like an oil professor

[Jueshen]

im also using shell helix hx7 10w40
Yosh recommends it!

[jtm]

VW specifies castrol 5w40 fully synthetic for my car and I have been using this oil in all the turbo cars I have owned for years now. Recently I tried shell helix hx7 10w40 and could not really notice any difference in how the car ran. I have seen Porsche specifies Mobil one 0w40 for all their cars and more improtantly I saw a quart in the luggage compartment of a 996 turbo. 10w40 is thicker than 5w40 and 5w40 is thicker than 0w40? Why is it that Porsche would specify a "thinner" oil for their turbo model than VW does?

Did somebody recommend this or why did you try this?

Won't the thicker oil that is not manufacturer spec perhaps cause damage like wear on camshaft lobes?

[joggiep]

My only thought on this would be that when the build the said Porsche motor they build it with better components with smaller tolerances than your avg. VW motor. So when cold you need a thinner oil to get in everywhere and lube those finely mashined parts properly.

[Neuk]

VW specifies castrol 5w40 fully synthetic for my car and I have been using this oil in all the turbo cars I have owned for years now. Recently I tried shell helix hx7 10w40 and could not really notice any difference in how the car ran. I have seen Porsche specifies Mobil one 0w40 for all their cars and more improtantly I saw a quart in the luggage compartment of a 996 turbo. 10w40 is thicker than 5w40 and 5w40 is thicker than 0w40? Why is it that Porsche would specify a "thinner" oil for their turbo model than VW does?

Did somebody recommend this or why did you try this?

Won't the thicker oil that is not manufacturer spec perhaps cause damage like wear on camshaft lobes?

Its only thicker at lower temperatures but in my opinion, this is one of the most important times as you need oil to circulate as quickly as possible...

[ruan9n]

Did somebody recommend this or why did you try this?

Won't the thicker oil that is not manufacturer spec perhaps cause damage like wear on camshaft lobes?

My good friend who is a master technician at Nissan did an oil change for me before we went on dubrun and he reccomended it. Said it's the only oil he uses and that castrol is bla bla bla bla. My paranoid mind didn't play too well with this as has been said, a thinner oil wil recirculate quicker at initial startup, and the known issue of the mk6's cam chain tensioner losing oil pressure and that causing it to break haunted me. I did 2000km on that oil and took my car to vw for 60k service at 59k so I could be on the right spec oil again.

[Hotdubz]

Did somebody recommend this or why did you try this?

Won't the thicker oil that is not manufacturer spec perhaps cause damage like wear on camshaft lobes?

My good friend who is a master technician at Nissan did an oil change for me before we went on dubrun and he reccomended it. Said it's the only oil he uses and that castrol is bla bla bla bla. My paranoid mind didn't play too well with this as has been said, a thinner oil wil recirculate quicker at initial startup, and the known issue of the mk6's cam chain tensioner losing oil pressure and that causing it to break haunted me. I did 2000km on that oil and took my car to vw for 60k service at 59k so I could be on the right spec oil again.

read here for some Castrol and oil info
http://www.vwclub.co.za/phpbb3/viewtopi ... it=castrol

[LoW n SloW]

My only thought on this would be that when the build the said Porsche motor they build it with better components with smaller tolerances than your avg. VW motor. So when cold you need a thinner oil to get in everywhere and lube those finely mashined parts properly.

couldnt agree more

[graham savage]

TBH i don't see much difference in viscosity between a 0w40 and 5w40 in our climate.

I get the same oil pressure on both in the winter at 3 degrees C. Maybe in places where it often goes -10 it'll be more beneficial?

[Killerwatt]

Just put the viscosity that the manufacturer recommends. Does your local mac down the road know all the bearing clearances and journal sizes?
Just use a good quality oil and you will be good.

[Neuk]

Just put the viscosity that the manufacturer recommends. Does your local mac down the road know all the bearing clearances and journal sizes?
Just use a good quality oil and you will be good.

And make sure the oil is the correct specification...

[Le Clue]

If the Germans at VW & Audi says use Castrol 5W40 then use it.

[Miela]

would love to get into this but i have a bit of a busy day ahead.

In short, thicker is not better nor does it give more protection.

There are many UAO's on Bob is the oil guy (BITOG) where 5w30's completely outperformed 0/5w40's in especially in metal wear. Flow lubricates, not thickness.

There is no material difference between a 0w40 and a 5w40 at operating temps. Like Polony said, they will only differ in flow at extremely low temperatures.

Thicker oils do how ever provide a margin of safety when running hot, but this has to do more with the HTHS rating of an oil at 150C as a w40 can have a higher HTHS than a w50 and protect better at racing like temperatures depending on the base of the oil .

As for the TWS mentioned (10w60), i personally use this when i do racing at track days in the Golf. Please note, this is for RACING on a circuit not drag racing.On a good track day i can easy be out for a full hour on the circuit hence me needed the additional shear protection at very high temperatures. My oil temp gauge goes up to 125C in the Golf when running hard long. A road car rarely sees 95C oil temp even on a pretty warm day. This type of oil should be avoided for your daily drive even if you do drag racing often especially in a modern car as its lack of flow at high temperatures can damage bearings. Note, i drain this immediately after a track day and fill with 5w40. Also, "racing" oils often have less detergents in them.

So what should you do with your G6 ? Simple. Stick to the manual. Use either a 5w40 or 5w30 , 502/505 spec oil and stick to your maintanence schedules. You could switch to Mobil 1 0w40 with no issues as its a 502/505 oil as well, so if anything goes wrong, you will still be covered by your warrantee because you used the correct spec oil.

To put it in perspective, my old Type R used a 0w30 oil. It pushed out nearly 160kw in an NA engine which revved to 8500rpm. I did about 8 or 9 track days in it and sold it on nearly 90 000km's with an engine which was running flawlessly purely because i stuck to what the manual recommended. I did however change the oil every 7500km but thats just me.

My new "Toybaru" runs a 0w20 oil and i plan to stick with it because thats what the manual recommends. Guys in the US have done many UOA's and it has been proven that the 0w20 does a fantastic job even for the guys who did the occasional track day.

Dont use the 10w40, its an inferior oil to the 5w40 regarding its base stock and additives. Stick with what the manual says. The guy who engineered your car knows allot more about whats right for it than anyone else.

[Howie-WP]

If the Germans at VW & Audi says use Castrol 5W40 then use it.

So simple, yet some people think they know better

[Miela]

If the Germans at VW & Audi says use Castrol 5W40 then use it.

So simple, yet some people think they know better

Actually, its even simpler. Any 502/505 certified oil will be the right oil

Here is the list of them from VW (both 502/505 and 504/507)

http://my-gti.com/wp-content/uploads/20 ... e_oils.pdf

as you can see, it included 5w30, 0w40 and 5w40 as i said above for petrol engines (502 and 504/ low saps)

[ruan9n]

^^^Even the shell helix hx7 10w40 had vw approved 505 written on it... Yosh also recommends it to all his unitronic customers. But I'm gonna stick with whatever I get from vw from now on. It's the first time ever I tried something else.

[Miela]

Yosh also recommends it to all his unitronic customers. But I'm gonna stick with whatever I get from vw from now on

Yeah, he is not offering the best advice regarding oil. HX7 is not a bad oil, its a pretty good group 3 hydrocracked mineral oil, but its not as good as your top tier group 4 fully synthetics which is recommended for your vehicle.

[PoLonY]

which 5W40 group 4 oils would you suggest then Miela

Castrol Edge full synth any good?
Shell helix ultra?

I generally use the Helix Ultra

[katotter]

Castrol Edge full synth any good?

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