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flipper's Avatar
 
Join Date: Mar 2005
Location: springfield, mo
Posts: 389
oil help needed

Hello all, I changed my oil for the first time and I put 5w 30 mobile 1 in. Is that the wrong weight? will it be fine till the next change?
I live in Missouri and the motor has 85000 miles
oh, and its a 99 2.5
Thanks all,
Shawn
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Old 10-17-2008, 05:36 AM
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Location: Planet Earth
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0W-40 is the proper weight.

All the Porsche approved oils are either 0W or 5W for the cold number, and 40 or 50 for the high number.

If it is going to be real cold for the duration of this OCI, and you don't drive on the track or push the engine real hard, 5W-30 might be OK, but don't call me if your engine grenades.
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Old 10-17-2008, 07:24 AM
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Mobil1 5W30 is "ok" if you understand what it is

If you look at the viscosity curves for M1 5W30 vs 0W40 vs temperature, they are quite similar except at extreme cold ( where 0W40 is slightly better) and when hot ( where 0W40 is significantly better). The biggest difference is that 0W40 carries the ACEA A3 certification - european testing for high performance motors. Why? because it meets a specific test for high speed, high temperature oil shear. The HTHS shear test requires a rating of 3.3 ( units) or better. M1 5W30 achieves about 2.9 on that test.

So, will it ruin your car? Under most circumstances, it will work just as well as the 0W40. But dont push it hard when its very hot. Dont race it or take it to the track or autoX. Basically understand what you have. Normal driving in cool or even moderate weather? Probably just fine.

About the worst test for such an oil is a turbocharged motor. And i used M1 blue cap for 80k miles in my Audi S4 bi-turbo. but I always drove it easy when cold, cooled it down, and changed the oil by 7500 miles. After 80k, when others were losing their turbos, mine were perfect and used not one drop of oil in 7500 miles.

So be smart and your ok. Planning to race this summer? Change th oil.

Grant
Old 10-23-2008, 11:38 AM
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Old 10-23-2008, 11:38 AM
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