azn123

can i use 10w-30w moble 1 oil for my 2002 tt
thx

aTTicism

5w40 Pentosynth would be better.

TTinCT

it might be less of an issue in the winter...but you may want to run the 5w30 in the summer....

OldSchool AG

10w30 if anything would be MORE of an issue in winter, but bottom line, it's the wrong viscosity so it's an issue period.

also, Audi's recommendation is 5w40... 5w30 is considered an acceptable alternative if 5w40 is not available.

Lowcountry

OK. Logic would dictate that a heavier weight oil would be less inclined to lose its viscosity. In a hot running engine, wouldn't you want such an oil? Why wouldn't the 10 weight be more beneficial in the 1.8 than the 5 weight, especially in the summer months?

OldSchool AG

Audi's engineers have determined that 5w40 is the proper weight for the 1.8T.

PS I went to GA Tech, man.... remember?

PPS However, I switched to a business major in my Freshman year

Lexx

in my MGB that is

Lowcountry

I was just expressing my lack of understanding, likely based on flawed logic on my part. I still don't understand why a lighter weight oil is better in a hot-running engine. I also don't understand the thought processes of the female example of our species. Any help with either of these puzzles is greatly appreciated.

PS. I forgive you for going to Tech.

OldSchool AG

so it's based on tolerances and other factors in addition to operating temp. that's why you see all these new engines recommending 5w20 (example the 02+ Miata does) -- the tolerances are so tight that a thicker oil, even at the high operating temps, would not flow well.

This is also why, especially in older motors, you will start to use thicker oil as the miles get high (worn bearings, etc). The idea is to stay in the sweet spot for flow rate.