1000km oil change - which oil to use?

**slidetaker** · 04-08-2008 08:14 AM

Wouldn't run Mobil1 5w50 in a Euro with 30k km...too thick too young.

**Eurotony** · 04-08-2008 08:30 AM

I would only use Mobil1 10w-30, which is the oil grade recommended for the Euro motor.

**tron07** · 04-08-2008 10:27 AM

After changing oil at 2k, you plan to change again at 5k? I think its a bit overkill to do so...

the manual didnt state you need to change oil at 1k too....

**aaronng** · 04-08-2008 10:53 AM

Originally Posted by corn_flakes

???

the viscosity rating at cold temps is 5.....the vis. rating of 50 is for 100deg celcius, so that shouldn't make a difference for cold starts.

am i right?

Cold rating is at -18 C, which we do not get. So the "5" is not really relevant in our aussie climate.

**Type R Positive** · 04-08-2008 02:46 PM

Originally Posted by tanalasta

The dealer does not recommend synthetic oils (ever) - something about the engine not bedding in properly

TRUE. (for break in period)

Originally Posted by tanalasta

and the temperature protection not being so good.

FALSE. VERY FALSE.

**Type R Positive** · 04-08-2008 02:48 PM

Originally Posted by corn_flakes

ok, i'm about to do my 30,000km service.

i know the recommended viscosity rating at high/running temperatures is max 40, but i have a bottle of mobil 1 5W-50.

what are your EXPERT opinions on using sae 50 oil? is it too thick at running temperature, or should i be ok to use it instead of a 40?

If you got 50wt, use it. It will be fine.

**tony1234** · 04-08-2008 05:01 PM

Originally Posted by Eurotony

I would only use Mobil1 10w-30, which is the oil grade recommended for the Euro motor.

Agreed.I wouldn't go above the"40"grade.

**Type R Positive** · 04-08-2008 10:44 PM

Can you boys tell the difference in oils?

I can't.

BTW, I run full synth 15w50 in my 13:1 comp 12,000rpm dirtbike, and I can't tell the difference between 15w50 and 10w40, besides the 15w50 seems to last longer.

**tony1234** · 05-08-2008 07:41 AM

Originally Posted by Type R Positive

Can you boys tell the difference in oils?

I can't.

BTW, I run full synth 15w50 in my 13:1 comp 12,000rpm dirtbike, and I can't tell the difference between 15w50 and 10w40, besides the 15w50 seems to last longer.

I can't either.But i wouldn't take the chance for no apparent gain in using a 50 grade over a 30 or 40 grade.

**slidetaker** · 05-08-2008 08:08 AM

A 50wt oil does have more drag inside the engine than a 40wt. In terms of horsepower and fuel eco, you probably can't tell driving it.

As 90% of engine wear occurs at start-up, a 50wt, Mobil 1 5W50 will have a thicker viscosity over 100cSt than a 5W40 around 70cSt to start off with. The viscosity of 50wt is further away from the operating temperature than a 40wt, it will take a slightly longer time for 50wt to increase its lubrication ability than a 40wt. Thus, the increase of start-up wear.

Furthermore, there is no real benefit using a 50wt than a 40wt in such a car with its nearly new condition. If it is a car over 200k km mileage battling fuel dilution, then that's a different story.